_30_60_90
_deg100
_hh
_isos_not_power_of_2
_isos_power_of_2
_isosceles
acute
deg100
deg100.exc
deg100.reg
grid2
hard_gap
intersection
leaf1
leaf2
line_of_tiles
motivation1
motivation2
not_palindromes
pat1
pat2
prove1
prove2
teeth
