diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9ea0f13
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.*
+!.gitignore
diff --git a/LICENSE.md b/LICENSE.md
new file mode 100644
index 0000000..1eaf351
--- /dev/null
+++ b/LICENSE.md
@@ -0,0 +1,29 @@
+BSD 3-Clause License
+
+Copyright (c) 2022, Journal of Hamradio Informatics
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..2d40dc7
--- /dev/null
+++ b/README.md
@@ -0,0 +1,22 @@
+Tutorial: Chapel the Parallel Programming Language
+====
+
+![image](https://img.shields.io/badge/Chapel-1.28-red.svg)
+![image](https://img.shields.io/badge/license-BSD%203--Clause-darkblue.svg)
+
+[うさぎさんでもわかる並列言語Chapel (PDF)](https://nextzlog.dev/chpl.pdf) [(HTML)](https://nextzlog.dev/chpl)
+
+## Contribution
+
+Feel free to make issues at [nextzlog/todo](https://github.com/nextzlog/todo).
+Follow [@nextzlog](https://twitter.com/nextzlog) on Twitter.
+
+## License
+
+### Author
+
+[無線部開発班](https://nextzlog.dev)
+
+### Clauses
+
+[BSD 3-Clause License](LICENSE.md)
diff --git a/chapter1/baz.chpl b/chapter1/baz.chpl
new file mode 100644
index 0000000..bc5ed47
--- /dev/null
+++ b/chapter1/baz.chpl
@@ -0,0 +1,18 @@
+module Foo {
+	writeln("initilize Foo");
+	proc main() {
+		writeln("This is Foo");
+	}
+}
+module Bar {
+	writeln("initilize Bar");
+	proc main() {
+		writeln("This is Bar");
+	}
+}
+import baz.Foo;
+import baz.Bar;
+proc main() {
+	Foo.main();
+	Bar.main();
+}
diff --git a/chapter1/hello.chpl b/chapter1/hello.chpl
new file mode 100644
index 0000000..30e60d1
--- /dev/null
+++ b/chapter1/hello.chpl
@@ -0,0 +1,5 @@
+/*
+multiline comments
+ or block comments
+*/
+writeln("Hello, world!"); // 1-line comments
diff --git a/chapter2/cast.chpl b/chapter2/cast.chpl
new file mode 100644
index 0000000..b6bae45
--- /dev/null
+++ b/chapter2/cast.chpl
@@ -0,0 +1,2 @@
+writeln(1 + 2: real); // 3.0
+writeln(int: string); // int(64)
diff --git a/chapter2/reduce.chpl b/chapter2/reduce.chpl
new file mode 100644
index 0000000..23f5374
--- /dev/null
+++ b/chapter2/reduce.chpl
@@ -0,0 +1,3 @@
+writeln(+ scan(1..10)); // 1 3 6 10 15 21 28 36 45 55
+writeln("value, index: ", minloc reduce zip([3, 2, 1], 0..2)); // value, index: (1, 2)
+writeln("value, index: ", maxloc reduce zip([4, 5, 6], 0..2)); // value, index: (6, 2)
diff --git a/chapter3/config.chpl b/chapter3/config.chpl
new file mode 100644
index 0000000..0cc3276
--- /dev/null
+++ b/chapter3/config.chpl
@@ -0,0 +1,4 @@
+config param foo = 121;
+config const bar = 121;
+config type num = uint;
+writeln(foo, bar, num: string);
diff --git a/chapter3/const.chpl b/chapter3/const.chpl
new file mode 100644
index 0000000..97971e6
--- /dev/null
+++ b/chapter3/const.chpl
@@ -0,0 +1,2 @@
+const foo: int = 12;
+const bar = 12;
diff --git a/chapter3/param.chpl b/chapter3/param.chpl
new file mode 100644
index 0000000..1fbeceb
--- /dev/null
+++ b/chapter3/param.chpl
@@ -0,0 +1,3 @@
+param foo: int = 12;
+param bar = 12;
+type num = int;
diff --git a/chapter3/types.chpl b/chapter3/types.chpl
new file mode 100644
index 0000000..9209272
--- /dev/null
+++ b/chapter3/types.chpl
@@ -0,0 +1,7 @@
+param a: bool = true;
+param b: uint = 1919;
+param c: real = 8.10;
+param d: imag = 364i;
+param e: string = 'ABC' + "DEF";
+param f: Gibier = Gibier.Rabbit;
+enum Gibier {Deer, Boar, Rabbit};
diff --git a/chapter3/var.chpl b/chapter3/var.chpl
new file mode 100644
index 0000000..d80bf0e
--- /dev/null
+++ b/chapter3/var.chpl
@@ -0,0 +1,7 @@
+var foo: int = 12;
+var bar: int;
+foo = 889464;
+var a = "golden axe.";
+var b = "silver axe.";
+a <=> b;
+writeln(a, b, foo);
diff --git a/chapter4/break.chpl b/chapter4/break.chpl
new file mode 100644
index 0000000..0252d7d
--- /dev/null
+++ b/chapter4/break.chpl
@@ -0,0 +1,3 @@
+while true do break;
+for 1..100 do continue;
+label outside for i in 1..10 do for j in 1..10 do break outside;
diff --git a/chapter4/for.chpl b/chapter4/for.chpl
new file mode 100644
index 0000000..4a65486
--- /dev/null
+++ b/chapter4/for.chpl
@@ -0,0 +1 @@
+for i in 1..100 do writeln(i);
diff --git a/chapter4/if.chpl b/chapter4/if.chpl
new file mode 100644
index 0000000..74b2096
--- /dev/null
+++ b/chapter4/if.chpl
@@ -0,0 +1,6 @@
+const age = 18;
+if age < 18 then {
+	writeln("Adults Only");
+} else {
+	writeln("Yeah, Right");
+}
diff --git a/chapter4/scope.chpl b/chapter4/scope.chpl
new file mode 100644
index 0000000..6dcb298
--- /dev/null
+++ b/chapter4/scope.chpl
@@ -0,0 +1,6 @@
+{
+	var foo = 12;
+	writeln(foo);
+}
+var foo = 13;
+writeln(foo);
diff --git a/chapter4/select.chpl b/chapter4/select.chpl
new file mode 100644
index 0000000..c46008e
--- /dev/null
+++ b/chapter4/select.chpl
@@ -0,0 +1,5 @@
+select "cat" {
+	when "cat" do writeln("meow");
+	when "dog" do writeln("bowwow");
+	otherwise writeln("gobblegobble");
+}
diff --git a/chapter4/while.chpl b/chapter4/while.chpl
new file mode 100644
index 0000000..0231a32
--- /dev/null
+++ b/chapter4/while.chpl
@@ -0,0 +1,4 @@
+var i = 1;
+while i < 1024 do i *= 2;
+do i >>= 1; while i >= 1;
+writeln(i); // 0
diff --git a/chapter5/default.chpl b/chapter5/default.chpl
new file mode 100644
index 0000000..57a0fe5
--- /dev/null
+++ b/chapter5/default.chpl
@@ -0,0 +1,4 @@
+proc foo(x: int = 0, y: int = 0): int return x + y;
+writeln(foo(x = 1, y = 2)); // 3
+writeln(foo(y = 2, x = 1)); // 3
+writeln(foo(1)); // 1
diff --git a/chapter5/fact.chpl b/chapter5/fact.chpl
new file mode 100644
index 0000000..6e5edb3
--- /dev/null
+++ b/chapter5/fact.chpl
@@ -0,0 +1,3 @@
+proc fact(param n: int) param: int where n >= 1 return n * fact(n-1);
+proc fact(param n: int) param: int where n == 0 return 1;
+if fact(8) != 5040 then compilerError("fact(7) == 5040");
diff --git a/chapter5/infer.chpl b/chapter5/infer.chpl
new file mode 100644
index 0000000..fc4c885
--- /dev/null
+++ b/chapter5/infer.chpl
@@ -0,0 +1,3 @@
+proc foo(x, y) return x + y;
+writeln(foo(1, 2i)); // 1 + 2i
+writeln(foo(2i, 3)); // 3 + 2i
diff --git a/chapter5/inline.chpl b/chapter5/inline.chpl
new file mode 100644
index 0000000..46c0600
--- /dev/null
+++ b/chapter5/inline.chpl
@@ -0,0 +1,4 @@
+inline proc foo(x: int): int return 2 * x;
+export proc bar(x: int): int return 2 * x;
+writeln(foo(100)); // 200
+writeln(bar(300)); // 600
diff --git a/chapter5/intent.chpl b/chapter5/intent.chpl
new file mode 100644
index 0000000..be63012
--- /dev/null
+++ b/chapter5/intent.chpl
@@ -0,0 +1,11 @@
+proc intents(inout x: int, in y: int, out z: int, ref v: int): void {
+	x += y;
+	z += y;
+	v += y;
+}
+var a: int = 1;
+var b: int = 2;
+var c: int = 3;
+var d: int = 4;
+intents(a, b, c, d);
+writeln(a, b, c, d); // 3226
diff --git a/chapter5/iter.chpl b/chapter5/iter.chpl
new file mode 100644
index 0000000..33aff3f
--- /dev/null
+++ b/chapter5/iter.chpl
@@ -0,0 +1,11 @@
+iter iterator(): string {
+	yield "EMURATED";
+	yield "EMURATED";
+	yield "EMURATED";
+}
+iter int.these() const ref: int {
+	for i in 1..this do yield i;
+}
+var repetition: int = 10;
+for i in iterator() do writeln(i);
+for i in repetition do writeln(i);
diff --git a/chapter5/lambda.chpl b/chapter5/lambda.chpl
new file mode 100644
index 0000000..75aa0ab
--- /dev/null
+++ b/chapter5/lambda.chpl
@@ -0,0 +1,3 @@
+proc call(f, x: int, y: int): int return f(x, y);
+const add = lambda(x: int, y: int) return x + y;;
+writeln(call(add: func(int, int, int), 36, 514)); // 550
diff --git a/chapter5/lvalue.chpl b/chapter5/lvalue.chpl
new file mode 100644
index 0000000..9b8bb33
--- /dev/null
+++ b/chapter5/lvalue.chpl
@@ -0,0 +1,4 @@
+var tuple = (0, 0, 0, 0, 0, 0, 0, 0, 0);
+proc A(i: int) ref: int return tuple(i);
+coforall i in tuple.indices do A(i) = i;
+writeln(tuple);
diff --git a/chapter5/name.chpl b/chapter5/name.chpl
new file mode 100644
index 0000000..e0f7206
--- /dev/null
+++ b/chapter5/name.chpl
@@ -0,0 +1,2 @@
+proc foo return 100110;
+writeln(foo);
diff --git a/chapter5/nest.chpl b/chapter5/nest.chpl
new file mode 100644
index 0000000..8b644b3
--- /dev/null
+++ b/chapter5/nest.chpl
@@ -0,0 +1,8 @@
+proc factorial(num: int): int {
+	proc tc(n, accum: int): int {
+		if n == 0 then return accum;
+		return tc(n - 1, n * accum);
+	}
+	return tc(num, 1);
+}
+writeln(factorial(10)); // 3628800
diff --git a/chapter5/operator.chpl b/chapter5/operator.chpl
new file mode 100644
index 0000000..5475d23
--- /dev/null
+++ b/chapter5/operator.chpl
@@ -0,0 +1,2 @@
+operator *(text: string, num: int) return + reduce (for 1..num do text);
+writeln("Lorem ipsum dolor sit amet, consectetur adipiscing elit" * 10);
diff --git a/chapter5/param.chpl b/chapter5/param.chpl
new file mode 100644
index 0000000..17a8c70
--- /dev/null
+++ b/chapter5/param.chpl
@@ -0,0 +1,2 @@
+proc tuplet(param dim: int, type eltType) type return dim * eltType;
+const septet: tuplet(7, int) = (114, 514, 1919, 810, 364, 889, 464);
diff --git a/chapter5/proc.chpl b/chapter5/proc.chpl
new file mode 100644
index 0000000..0ef8139
--- /dev/null
+++ b/chapter5/proc.chpl
@@ -0,0 +1,4 @@
+proc foo(x: int, y: int): int {
+	return x + y;
+}
+writeln(foo(1, 2));
diff --git a/chapter5/query.chpl b/chapter5/query.chpl
new file mode 100644
index 0000000..95fcd62
--- /dev/null
+++ b/chapter5/query.chpl
@@ -0,0 +1,6 @@
+proc foo(x: [?dom] ?el) return (dom, el: string);
+proc bar(x) return (x.domain, x.eltType: string);
+writeln(foo([1, 2, 3, 4, 5, 6, 7, 8])); // ({0..7}, int(64))
+writeln(bar([1, 2, 3, 4, 5, 6, 7, 8])); // ({0..7}, int(64))
+writeln(foo(["one" => 1, "two" => 2])); // ({one, two}, int(64))
+writeln(bar(["one" => 1, "two" => 2])); // ({one, two}, int(64))
diff --git a/chapter5/sched.chpl b/chapter5/sched.chpl
new file mode 100644
index 0000000..63691cd
--- /dev/null
+++ b/chapter5/sched.chpl
@@ -0,0 +1,3 @@
+require "sched.h";
+extern proc sched_getcpu(): int;
+writeln("CPU:", sched_getcpu());
diff --git a/chapter5/sched.h b/chapter5/sched.h
new file mode 100644
index 0000000..138759c
--- /dev/null
+++ b/chapter5/sched.h
@@ -0,0 +1 @@
+int sched_getcpu();
diff --git a/chapter5/throw.chpl b/chapter5/throw.chpl
new file mode 100644
index 0000000..50fb78e
--- /dev/null
+++ b/chapter5/throw.chpl
@@ -0,0 +1,10 @@
+proc foo(message: string) throws {
+	defer writeln("See you");
+	throw new Error(message);
+}
+try {
+	foo("Hello,");
+	foo("world!");
+} catch e {
+	writeln(e);
+}
diff --git a/chapter5/varargs.chpl b/chapter5/varargs.chpl
new file mode 100644
index 0000000..3a17e30
--- /dev/null
+++ b/chapter5/varargs.chpl
@@ -0,0 +1,2 @@
+proc sum(x: int ...): int return + reduce(x);
+writeln(sum(1, 2, 3) + sum((...(100, 200)))); // 306
diff --git a/chapter5/where.chpl b/chapter5/where.chpl
new file mode 100644
index 0000000..7d96903
--- /dev/null
+++ b/chapter5/where.chpl
@@ -0,0 +1,6 @@
+proc whichType(x: ?xt): string where xt == real return "x is real";
+proc whichType(x: ?xt): string where xt == imag return "x is imag";
+proc whichType(x: ?xt): string return "x is neither real nor imag";
+writeln(whichType(114.514));
+writeln(whichType(364364i));
+writeln(whichType(1919810));
diff --git a/chapter6/accessor.chpl b/chapter6/accessor.chpl
new file mode 100644
index 0000000..600654c
--- /dev/null
+++ b/chapter6/accessor.chpl
@@ -0,0 +1,10 @@
+record User {
+	var name: string;
+}
+proc User.name ref {
+	writeln(".name");
+	return this.name;
+}
+var user: User;
+user.name = "Jane";
+writeln(user.name);
diff --git a/chapter6/deinit.chpl b/chapter6/deinit.chpl
new file mode 100644
index 0000000..73cd314
--- /dev/null
+++ b/chapter6/deinit.chpl
@@ -0,0 +1,9 @@
+class Sub {
+	const x: real = 0;
+	const y: real = 0;
+	proc deinit() {
+		writeln("deleted");
+	}
+}
+const sub = new Sub(x = 1, y = 2);
+writeln("x, y: ", (sub.x, sub.y));
diff --git a/chapter6/duck.chpl b/chapter6/duck.chpl
new file mode 100644
index 0000000..053398d
--- /dev/null
+++ b/chapter6/duck.chpl
@@ -0,0 +1,9 @@
+class Duck {
+	proc quack() return "quack!";
+}
+class Kamo {
+	proc quack() return "quack!";
+}
+proc voice(x) return x.quack();
+writeln(voice(new Duck())); // quack!
+writeln(voice(new Kamo())); // quack!
diff --git a/chapter6/generics.chpl b/chapter6/generics.chpl
new file mode 100644
index 0000000..94d9d6a
--- /dev/null
+++ b/chapter6/generics.chpl
@@ -0,0 +1,8 @@
+record Stack {
+	type eltType;
+	param size: int;
+}
+var a: Stack(eltType = uint, size = 12);
+var b: Stack(eltType = real, size = 24);
+writeln("a is ", a.type: string); // a is Stack(uint(64), 12)
+writeln("b is ", b.type: string); // b is Stack(real(64), 24)
diff --git a/chapter6/inherit.chpl b/chapter6/inherit.chpl
new file mode 100644
index 0000000..1ace22f
--- /dev/null
+++ b/chapter6/inherit.chpl
@@ -0,0 +1,10 @@
+class Foo {
+	proc foo() return "foo!";
+}
+class Bar: Foo {
+	override proc foo() return super.foo() + "bar!";
+}
+const foo = new Foo();
+const bar = new Bar();
+writeln(foo.foo()); // foo!
+writeln(bar.foo()); // foo!bar!
diff --git a/chapter6/init.chpl b/chapter6/init.chpl
new file mode 100644
index 0000000..31b0bc9
--- /dev/null
+++ b/chapter6/init.chpl
@@ -0,0 +1,10 @@
+class Add {
+	const x: real;
+	const y: real;
+	proc init(x, y) {
+		this.x = x;
+		this.y = y;
+	}
+}
+const add = new Add(x = 1, y = 2);
+writeln("x, y: ", (add.x, add.y));
diff --git a/chapter6/method.chpl b/chapter6/method.chpl
new file mode 100644
index 0000000..8dda098
--- /dev/null
+++ b/chapter6/method.chpl
@@ -0,0 +1,9 @@
+record User {
+	var name: string;
+	proc set(name) {
+		this.name = name;
+	}
+}
+var user: User;
+user.set("Alicia");
+writeln(user.name);
diff --git a/chapter6/num1.chpl b/chapter6/num1.chpl
new file mode 100644
index 0000000..48477db
--- /dev/null
+++ b/chapter6/num1.chpl
@@ -0,0 +1,8 @@
+class Num {
+	var r: real;
+	var i: imag;
+}
+var num: Num = new Num();
+num.r = 816.07;
+num.i = 14.22i;
+writeln(num.r);
diff --git a/chapter6/num2.chpl b/chapter6/num2.chpl
new file mode 100644
index 0000000..3651475
--- /dev/null
+++ b/chapter6/num2.chpl
@@ -0,0 +1,8 @@
+record Num {
+	var r: real;
+	var i: imag;
+}
+var num: Num;
+num.r = 816.07;
+num.i = 14.22i;
+writeln(num.r);
diff --git a/chapter6/num3.chpl b/chapter6/num3.chpl
new file mode 100644
index 0000000..c96f639
--- /dev/null
+++ b/chapter6/num3.chpl
@@ -0,0 +1,8 @@
+union Num {
+	var r: real;
+	var i: imag;
+}
+var num: Num;
+num.r = 816.07;
+num.i = 14.22i;
+writeln(num.i);
diff --git a/chapter6/owned.chpl b/chapter6/owned.chpl
new file mode 100644
index 0000000..182d5a1
--- /dev/null
+++ b/chapter6/owned.chpl
@@ -0,0 +1,7 @@
+class Hello {
+	proc deinit() {
+		writeln("See you");
+	}
+}
+var hello: owned Hello = new owned Hello();
+var hallo: borrowed Hello = hello.borrow();
diff --git a/chapter6/shared.chpl b/chapter6/shared.chpl
new file mode 100644
index 0000000..8afe15c
--- /dev/null
+++ b/chapter6/shared.chpl
@@ -0,0 +1,7 @@
+class Hello {
+	proc deinit() {
+		writeln("See you");
+	}
+}
+var hello = new shared Hello();
+var hallo = new unmanaged Hello();
diff --git a/chapter6/this.chpl b/chapter6/this.chpl
new file mode 100644
index 0000000..87c59bd
--- /dev/null
+++ b/chapter6/this.chpl
@@ -0,0 +1,5 @@
+class Add {
+	proc this(a: int, b: int): int return a + b;
+}
+const add = new Add();
+writeln(add(123, 45)); // 168
diff --git a/chapter7/array.chpl b/chapter7/array.chpl
new file mode 100644
index 0000000..0d34baf
--- /dev/null
+++ b/chapter7/array.chpl
@@ -0,0 +1,4 @@
+const rectangular = [1, 2, 3, 4, 5, 6, 7, 8];
+const associative = [1 => "one", 2 => "two"];
+writeln(rectangular, rectangular.domain); // 1 2 3 4 5 6 7 8{0..7}
+writeln(associative, associative.domain); // one two{1, 2}
diff --git a/chapter7/by.chpl b/chapter7/by.chpl
new file mode 100644
index 0000000..36bbaf2
--- /dev/null
+++ b/chapter7/by.chpl
@@ -0,0 +1,3 @@
+writeln(10..30 by -7);              // 30 23 16
+writeln(10..30 by -7 align 13);     // 27 20 13
+writeln(10..30 by -7 align 13 # 2); // 27 20
diff --git a/chapter7/domain.chpl b/chapter7/domain.chpl
new file mode 100644
index 0000000..abe58aa
--- /dev/null
+++ b/chapter7/domain.chpl
@@ -0,0 +1,6 @@
+const rectangular: domain = {0..10, -1..2};
+const associative: domain = {"foo", "bar"};
+writeln(rectangular.rank);
+writeln(rectangular.dims());
+writeln(rectangular.idxType: string); // int(64)
+writeln(associative.idxType: string); // string
diff --git a/chapter7/for.chpl b/chapter7/for.chpl
new file mode 100644
index 0000000..e4cba51
--- /dev/null
+++ b/chapter7/for.chpl
@@ -0,0 +1,3 @@
+for i in 1..100 do writeln(i);
+forall i in 1..100 do writeln(i);
+coforall i in 1..100 do writeln(i);
diff --git a/chapter7/loops.chpl b/chapter7/loops.chpl
new file mode 100644
index 0000000..3345db7
--- /dev/null
+++ b/chapter7/loops.chpl
@@ -0,0 +1,2 @@
+for xyz in {1..10, 1..10, 1..10} do writeln(xyz);
+for boy in {"Tom", "Ken", "Bob"} do writeln(boy);
diff --git a/chapter7/pass.chpl b/chapter7/pass.chpl
new file mode 100644
index 0000000..dca6297
--- /dev/null
+++ b/chapter7/pass.chpl
@@ -0,0 +1,8 @@
+proc update(arr: [] int) {
+	arr = [2, 3, 4];
+}
+var A = [1, 2, 3];
+var B = A;
+update(A);
+writeln(A); // 2 3 4
+writeln(B); // 1 2 3
diff --git a/chapter7/pattern.chpl b/chapter7/pattern.chpl
new file mode 100644
index 0000000..10cdae0
--- /dev/null
+++ b/chapter7/pattern.chpl
@@ -0,0 +1,2 @@
+proc foo(x: int, (y, z): (int, int)): int return x * (y + z);
+writeln(foo(2, (3, 4))); // 14
diff --git a/chapter7/range.chpl b/chapter7/range.chpl
new file mode 100644
index 0000000..9e11a7a
--- /dev/null
+++ b/chapter7/range.chpl
@@ -0,0 +1,3 @@
+const from100To200: range(int, boundedType = BoundedRangeType.bounded) = 100..200;
+const from100ToInf: range(int, boundedType = BoundedRangeType.boundedLow) = 100..;
+const fromInfTo200: range(int, boundedType = BoundedRangeType.boundedHigh) = ..20;
diff --git a/chapter7/ref.chpl b/chapter7/ref.chpl
new file mode 100644
index 0000000..806cb8f
--- /dev/null
+++ b/chapter7/ref.chpl
@@ -0,0 +1,3 @@
+var boys = ['Tom', 'Ken', 'Bob'];
+for boy in boys do boy += '-san';
+writeln(boys); // Tom-san Ken-san Bob-san
diff --git a/chapter7/size.chpl b/chapter7/size.chpl
new file mode 100644
index 0000000..0869803
--- /dev/null
+++ b/chapter7/size.chpl
@@ -0,0 +1,5 @@
+writeln((100..200).size);      // 101
+writeln((100..200).low);       // 100
+writeln((100..200).high);      // 200
+writeln((100..200).stride);    //   1
+writeln((100..200).alignment); // 100
diff --git a/chapter7/sparse.chpl b/chapter7/sparse.chpl
new file mode 100644
index 0000000..f5aa8ad
--- /dev/null
+++ b/chapter7/sparse.chpl
@@ -0,0 +1,5 @@
+var D: sparse subdomain({1..16, 1..64});
+var A: [D] real;
+D += (8, 10);
+D += (3, 64);
+A[8, 10] = 114.514;
diff --git a/chapter7/subarray.chpl b/chapter7/subarray.chpl
new file mode 100644
index 0000000..83a963b
--- /dev/null
+++ b/chapter7/subarray.chpl
@@ -0,0 +1,5 @@
+var A: [{1..10, 1..10}] real;
+var B: [{'foo', 'bar'}] real;
+A[1, 2] = 1.2;
+A(3, 4) = 3.4;
+writeln(A(1..2, 1..3));
diff --git a/chapter7/tuple.chpl b/chapter7/tuple.chpl
new file mode 100644
index 0000000..edabbcb
--- /dev/null
+++ b/chapter7/tuple.chpl
@@ -0,0 +1,3 @@
+const nums: 9 * int = (60, 45, 53, 163, 90, 53, 165, 75, 60);
+const boys: (string, string, string) = ("Tom", "Ken", "Bob");
+writeln(boys(0), boys(1), boys(2), for name in boys do name); // TomKenBobTom Ken Bob
diff --git a/chapter7/unpack.chpl b/chapter7/unpack.chpl
new file mode 100644
index 0000000..0b734e7
--- /dev/null
+++ b/chapter7/unpack.chpl
@@ -0,0 +1,2 @@
+var (a, b): (string, int) = ("student", 24);
+writeln(a, b);
diff --git a/chapter8/atomic.chpl b/chapter8/atomic.chpl
new file mode 100644
index 0000000..38d8167
--- /dev/null
+++ b/chapter8/atomic.chpl
@@ -0,0 +1,7 @@
+config const N = 80;
+var sum: atomic int;
+do {
+	coforall n in 1..N do sum.sub(n * n);
+	coforall n in 1..N do sum.add(n * n);
+} while sum.read() == 0; // infinite loop
+writeln(sum);
diff --git a/chapter8/begin.chpl b/chapter8/begin.chpl
new file mode 100644
index 0000000..904142a
--- /dev/null
+++ b/chapter8/begin.chpl
@@ -0,0 +1,6 @@
+sync {
+	begin writeln("1st parallel task");
+	begin writeln("2nd parallel task");
+	begin writeln("3rd parallel task");
+}
+writeln("task 1, 2, 3 are finished");
diff --git a/chapter8/block.chpl b/chapter8/block.chpl
new file mode 100644
index 0000000..5868294
--- /dev/null
+++ b/chapter8/block.chpl
@@ -0,0 +1,3 @@
+use BlockDist;
+var A: [{1..10,1..10} dmapped Block(boundingBox={1..10,1..10})] real;
+for l in Locales do on l do for (i, j) in A.localSubdomain() do writeln(A(i, j).locale);
diff --git a/chapter8/cobegin.chpl b/chapter8/cobegin.chpl
new file mode 100644
index 0000000..eceb15a
--- /dev/null
+++ b/chapter8/cobegin.chpl
@@ -0,0 +1,6 @@
+cobegin {
+	writeln("1st parallel task");
+	writeln("2nd parallel task");
+	writeln("3rd parallel task");
+}
+writeln("task 1, 2, 3 are finished");
diff --git a/chapter8/cyclic.chpl b/chapter8/cyclic.chpl
new file mode 100644
index 0000000..03b74b6
--- /dev/null
+++ b/chapter8/cyclic.chpl
@@ -0,0 +1,3 @@
+use CyclicDist;
+var B: [{1..10,1..10} dmapped Cyclic(startIdx=(1,1))] real;
+for l in Locales do on l do for (i, j) in B.localSubdomain() do writeln(B(i, j).locale);
diff --git a/chapter8/forall.chpl b/chapter8/forall.chpl
new file mode 100644
index 0000000..f2ecf2f
--- /dev/null
+++ b/chapter8/forall.chpl
@@ -0,0 +1,3 @@
+forall i in 1..100 do writeln(i);
+coforall i in 1..100 do writeln(i);
+sync for i in 1..100 do begin writeln(i);
diff --git a/chapter8/iter.chpl b/chapter8/iter.chpl
new file mode 100644
index 0000000..76ea845
--- /dev/null
+++ b/chapter8/iter.chpl
@@ -0,0 +1,16 @@
+iter foo(rng): int {
+	for i in rng do yield i;
+}
+iter foo(param tag, rng): range where tag == iterKind.leader {
+	if rng.size > 16 {
+		const mid = (rng.high + rng.low) / 2;
+		cobegin {
+			for i in foo(tag, rng(..mid+0)) do yield i;
+			for i in foo(tag, rng(mid+1..)) do yield i;
+		}
+	} else yield rng;
+}
+iter foo(param tag, rng, followThis): int where tag == iterKind.follower {
+	for i in followThis do yield i;
+}
+forall i in foo(1..100) do writeln(i);
diff --git a/chapter8/locale.chpl b/chapter8/locale.chpl
new file mode 100644
index 0000000..86ffa41
--- /dev/null
+++ b/chapter8/locale.chpl
@@ -0,0 +1,5 @@
+coforall l in Locales do on l {
+	writeln(here == l);
+	writeln(here.name);
+	writeln(here.numPUs());
+}
diff --git a/chapter8/on.chpl b/chapter8/on.chpl
new file mode 100644
index 0000000..0b5e158
--- /dev/null
+++ b/chapter8/on.chpl
@@ -0,0 +1,4 @@
+import BigInteger;
+var x: BigInteger.bigint;
+on Locales(0) do x = new BigInteger.bigint(12);
+on x.locale do writeln(x, " is on ", x.locale);
diff --git a/chapter8/race.chpl b/chapter8/race.chpl
new file mode 100644
index 0000000..4709597
--- /dev/null
+++ b/chapter8/race.chpl
@@ -0,0 +1,7 @@
+config const N = 80;
+var sum: int;
+do {
+	coforall n in 1..N with(ref sum) do sum -= n * n;
+	coforall n in 1..N with(ref sum) do sum += n * n;
+} while sum == 0;
+writeln(sum);
diff --git a/chapter8/serial.chpl b/chapter8/serial.chpl
new file mode 100644
index 0000000..c3383b5
--- /dev/null
+++ b/chapter8/serial.chpl
@@ -0,0 +1,4 @@
+serial true {
+	begin writeln("1st serial task");
+	begin writeln("2nd serial task");
+}
diff --git a/chapter8/shamble.chpl b/chapter8/shamble.chpl
new file mode 100644
index 0000000..de1f213
--- /dev/null
+++ b/chapter8/shamble.chpl
@@ -0,0 +1,10 @@
+inline proc string.shambles: void {
+	proc traverse(a: int, b: int) {
+		if b > a {
+			const mid = (a + b) / 2;
+			begin traverse(a, 0 + mid);
+			begin traverse(1 + mid, b);
+		} else writeln(this(a));
+	}
+	sync traverse(0, this.size - 1);
+}
diff --git a/chapter8/sync.chpl b/chapter8/sync.chpl
new file mode 100644
index 0000000..62dd19b
--- /dev/null
+++ b/chapter8/sync.chpl
@@ -0,0 +1,13 @@
+config const N = 80;
+var sum: sync int = 0;
+do {
+	coforall n in 1..N do {
+		const v = sum.readFE();
+		sum.writeEF(v + n * n);
+	}
+	coforall n in 1..N do {
+		const v = sum.readFE();
+		sum.writeEF(v - n * n);
+	}
+} while sum.readFF() == 0; // infinite loop
+writeln(sum.readFF());
diff --git a/chapter8/with.chpl b/chapter8/with.chpl
new file mode 100644
index 0000000..5dde7a2
--- /dev/null
+++ b/chapter8/with.chpl
@@ -0,0 +1,8 @@
+var a: string;
+var b: string;
+sync {
+	begin with(ref a) a = "1st parallel task";
+	begin with(ref b) b = "2nd parallel task";
+}
+writeln(a);
+writeln(b);