Full flush
6 han (5 han if called)#Only one suit, no honours.
Example
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Win9 Characters
Counted by the scoring program:
- Pinfu1 han · Japanese mahjong yaku
- Full flush6 han · Japanese mahjong yaku
- Total7 han, 30 fu · Japanese mahjong yaku
Counterexample
1 Characters2 Characters3 Characters3 Characters4 Characters5 Characters5 Characters6 Characters7 Characters7 Characters8 Characters9 Characters9 Dots
Win9 Dots
The pair is in dots, so there is more than one suit.