The next paragraphs explains that sentence (daimon, yamaguchi-dumi). 'hishi-gata' wasn't but from a quick google I understand that it means 'diamond-shaped'. I

The next paragraphs explains that sentence (daimon, yamaguchi-dumi). 'hishi-gata' wasn't but from a quick google I understand that it means 'diamond-shaped'. I admit that I found it frustrating as well.