Accumulating values from a sub-program in a loop

[jelling]

I have a data structure like sentences = ["sentence 1", "sentence 2", etc...]

For each value in sentences I want to generate Y number of responses. I can do this with a sub-program like this:

getAction = guidance(
'''
{{#block hidden=True}}
Describe a visual scene based on this sentence:
{{this}}
---
{{gen 'actions' n=3 stop="." max_tokens=50 temperature=0.9 frequency_penalty=1 presence_penalty=0.5}}
{{/block}}
{{actions}}
''')

getActions = guidance("""
{{#each sentences}}
{{>getAction}}
{{/each}}
""")

...but that just returns strings when what I want is a list of lists.

So how do I accumulate a list of lists?

Also, I could be wrong, but it doesn't seem possible to specify parameter names when calling the sub-program. And instead the sub-program had to use the same variable name as would be set in the parent context. Ideally, passing name parameters would be possible. And if not, some clearer docs on working with sub-programs would be helpful.

[jelling]

Figured it out. What I was missing is that when a sub-program access the current item in the each (using this), it can also modify that item. Can't decide if I absorbed too much FP or was just being dumb.