top | item 30409189 (no title) sshb | 4 years ago Curious about group theory take on this. It seems that symmetry helps to easily exclude multiple shapes at the beginning of each round. discuss order hn newest whatshisface|4 years ago If you can turn one into the other with a single reflection, then you can't rotate them. Two reflections, and you can.
whatshisface|4 years ago If you can turn one into the other with a single reflection, then you can't rotate them. Two reflections, and you can.
whatshisface|4 years ago