64 · Chow patterns
Conditions
123, 123, 789, 789 and a pair of 5s, all in one suit. The exclusion list combines the 1998 text and the WMO Seven Pairs exclusion.
How to build it
Plan the starting ranks of the required chows. Leave enough tiles for the remaining set and pair, and check which combinations share sets.
Key tile shapes
Patterns not counted together
Seven Pairs · Full Flush · All Chows · Pure Double Chow · Two Terminal Chows · No Honors · One Voided Suit