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040000 tree ca16d859452b7a12fe32e9e3fad41f2cc110b3d4	loopback
040000 tree 3ef57292eaad5633d2875a49e38b764a8650d090	utils
040000 tree b874c4da29de0dfad20835b4fdd3ef7eb15497d4	write_sine