040000 tree f593d700305239178dd2f6fa6f302577539c89ac	collect
040000 tree 4c6296badf4e6b1d02feda8d96009ee76b1ba037	math
040000 tree e715a372f8c9be68dfc1a7e3d336f677c58f6e3c	primitives
040000 tree 5be076f5bb525d28cd324684602145f537c388d9	testing
040000 tree 3c9b71e293b837f7c1912a61c8743d42248cd607	util