suan­pan – Meta­Post macros for draw­ing Chi­nese and Ja­panese abaci

Th­ese macros are de­scribed in
De­nis Roegel: Meta­Post macros for draw­ing Chi­nese and Ja­panese abaci, TUGboat (vol­ume 30, num­ber 1, 2009, pages 74-79)