Answer
Commentary
Leave an exchangeable for terminals
It seems equal whichever you choice.
This form is frequently seen, so you remember in a fixed form.
If you have a triple side wait (1-4-7, or 3-6-9) ＋ lined pair (33 66, or 44 77) ; only 2 pattern
・pattern1
1-4-7 waiting ＋ 33 66 (this case)
23456789 ＋3 6 pair ＝ 2 3 3 4 5 6 6 7 8 9
・pattern2
3-6-9 waiting ＋44 77
12345678 ＋4 4 pair＝1 2 3 4 4 5 6 7 7 8
you Should leave an exchangeable for terminals ; that is 6 or 4.
So you must discard 3 or 7.
The reason is there is a difference in drawing 7 (pattern1) or 3(pattern2).
In this case, when you draw 7 if you discard 6 is below
3 is leftover tile, and you miss all simples.
If you have discarded 3 first, your hand is below when you draw 7
you can discard 9 instead of 6, and you can get All simples.
It's a small detail, but the degree to which you take these considerations into account will make a difference in your mahjong skills.
If you want to become an advanced player, this is the basic knowledge you need.
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