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040000 tree 4a12eaaaf8500a4c7fcde21db557f114f042233d	echo
040000 tree eb63577a29330c15beb6d6433d1781f682f52e46	interfaces
040000 tree 700be29e17f8fd969604e23f175f2466c9d4d38b	pingpong
040000 tree 15f015d557c32d6bbfb7356bbf6e6db3df5a61ee	pingpong_target