Answer
Commentary
"Perfect" one before for ready
The form composed by complex serial pair ＋Ryanmen is called "perfect one before for ready"
In addition to Ryanmen, there is acceptance to make triplet.
There is 4 tiles more than Ryanmen-Ryanmen one before for ready.
But recently, it is calculated that this advantage is too little. (reffernce ; this book)
Especially, the part of complex serial pair is 4 5 6 like this case exceed the risk of leaving the tile.
If other player call for Riichi, you have to discard 6 (in this case) to the Riich in order to call Riich.
Ryanmen-Ryanmen wait for 16 tiles.
And this perfect one before for ready wait for 20 tiles.
In 16/20 case, Ryanmen is complete first.
And statistics reveal the risk exceed to the merit of leaving dangerous tile till ready hand.
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She really interested in, and smell it , and touch.
Be a nice butterfly.
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