The triangle is a passing pattern where three people stand in a triangular formation, and each person always passes to the next person to the right (or left).
<3p|3p|3p><3|3|3><3|3|3><3|3|3><3|3|3><3|3|3> |
<3p|3p|3p><3|3|3><3|3|3><3|3|3> |
<3p2|3p3|3p1><3|3|3><3|3|3><3p3|3p1|3p2><3|3|3><3|3|3> |
<3p|3p|3p><3|3|3> |
Outside 1-count <3p2|3p3|3p1><3p3|3p1|3p2> |
Inside 1-count <3p3|3p1|3p2><3p2|3p3|3p1> |
12 balls <(4x,4xp)|(4x,4xp)|(4x,4xp)> |
15 balls <5p|5p|5p><5|5|5> |