040000 tree 159026c350b3ca326bfb281d3c3e82be42263ad7	balancing
040000 tree 586e24fe0dccfd95f517f49799d671f867a2d509	datatypes
040000 tree 4633f82b1bdd6314da65c5978fb3227a426bbe02	fsm
040000 tree 9cf318ea8a3ece4cc9607ab8836f2c79619eab31	inlining