040000 tree 5cd5462994ef52a634c01c40e97f2dfb253f6aaf	build
040000 tree e2df088f0d29b4c0d6ebacd2fb2602d9a661c75c	it
040000 tree a955b84538b3adcf74d7ae325956f7df1c6a9989	main
040000 tree 0460aaddde6bed1334ec7e7a45548e372234a3ae	test