040000 tree cba526ca19625095002e1cc81aa6b1889a25f111	bazel_0.16.1
040000 tree 672b5855b6542e2329afceca4371b79ab0bca39f	bazel_0.17.1
040000 tree 295c7bc3047c70cc7291140d0d4ea7f4d5a255c5	bazel_0.18.0
040000 tree c45fdf7dc1028252bd07e40a6da840126b2f469f	bazel_0.19.0
040000 tree 95fe4b58d1e56a8750e724a3c2b2a3d9db4cd15d	bazel_0.21.0