040000 tree b04a28b391d78076ffc5db938a0740c447b307fc	abseil
040000 tree 0a2fb79f558e87f08ea142540b39b37149f56c23	concurrent
040000 tree b13759047a16b1ea1eabf544cccc6930b8fa6626	gflags
040000 tree 1ff753a26e5c08971f5a13dc4d7ce65c106291a4	mock
040000 tree 4a4c0c4ebb0a94fe1796973eeab06ddb4b924c77	six