C11111211113313112113313331333133313331333131211111211111211113313221213232321   >>    C1111121111331311211331333133313331333133313121111121111121111331322121323232   <<    C11111211113313112113313331333133313331333131211111211111211113313221213232323   >>      C11111211113313112113313331333133313331333131211111211111211113313221213232322   >>