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040000 tree c74d5403d78c771633415cf4af4068afcd2473e1	linewriter
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040000 tree 06bee219c20e46d63baa155e0496d313075e2e20	sleep
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040000 tree f867a8b40a1e65fde5ab1d4a1f08bb570c405c31	sync
040000 tree b86b1f0402120015d276bf8bba5d633df7d8ea1b	tcpip
040000 tree 3d66212a3d9b7fc58fce925371986153dd6ed7a8	waiter