16 · Chow patterns
Conditions
123 and 789 in each of two suits, plus a pair of 5s in the third suit. Exclusions include the WMO Pure Double Chow rule.
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
Mixed Double Chow · Pure Double Chow · Two Terminal Chows · All Chows · No Honors