output2.txt

MASK: 1f983a40c3f801b1
key: ???
some test pairs: [["4b0c569de9bf6510", "3298255d5314ad33"], ["5d81105912c7f421", "805146efee62f09f"], ["6e23f94180be2378", "207a88ced8ab64d1"], ["9751eeee344a8c74", "0b561354ebbb50fa"], ["f4fbf94509aaea25", "4ba4dc46bbde5c63"], ["3e571e4e9604769e", "10820c181de8c1df"], ["1f7b64083d9121e8", "0523ce32dd7a9f02"], ["69b3dfd8765d4267", "23c8d59a34553207"]]
flag: ceb51064c084e640690c31bf55c1df4950bc81b484f559dce0ae7d509aa0fe07f7ee127e9ecb05eb4b1b58b99494f72c0b4f3f5fe351c1cb