Big Four: All the wind cards (south, east, west, and west) become engraved (you can draw 3 by yourself, or you can touch or Kong), that is, 4 wind engraved, plus any 1 pair.

Xiao Si Xi: There are 3 pairs of wind cards (one less than the big Si Xi), plus 1 pair of any cards.

Big three yuan: all the arrows (medium, hair, white) are carved, that is, 3 arrows are carved, plus any 1 pair and 1 pair.

Small three yuan: There are 2 pairs of arrows (one less than the big three yuan), plus any two pairs.

In fact, "Sixi" and "Sanyuan" can be understood by looking at "four" and "three", but many people don't know about "big" and "small".