040000 tree d8cc3e736c930fedb59e199177b89d2232c83f4c	0_basics
040000 tree a125d34ef636871393c626e7208024bd9876dc0e	1_poly
040000 tree f70f5de73f021b637018c49e5a7e791ce49053fb	2_abstract
040000 tree a191824e10ce0aa2f611279fdb5d96d590b30cf1	3_records
040000 tree a6828c4bc773c0af6ddf9e4c79895d33b1a906f5	4_variants
040000 tree 55255d00ee815f66c08110de3473867b60b47b87	5_bang
040000 tree 21d3b06d3ce1993e546f1d2fedb5ab0905d95734	6_recursive