040000 tree 75f2c9d54d0bddc717243fb455930231fbca9ed5	core
040000 tree 40754cd24eb444bfe31f2279bcd1fd4f1d69f6fc	event
040000 tree d233a840d7a850d01ee04527033a73fbea45543e	http
040000 tree 6e3d2548470f404fe1285ed3aaf453cf368f7c6e	os