How are Li Ning's badminton shoes numbered? About flying close to the ground, why are the styles the same but the numbers different?

There are five models of Ayae 5 Lin Dan commemorative shoes for the 21 Asian Games, with Lin Dan's signature LOGO on the toe. Limited edition of 21 pairs

AYAF9 red

AYAF17 blue

AYZF7. Simple version, the insole is different without carbon board

AYZF9 popular version

The naming rules of Li Ning shoes are attached

First place: A Li Ning

Second place: Y badminton shoes

Third place: T training shoes; Z professional training shoes; A competition shoes (the bottom configuration is important, and cultural shoes are not included)

Fourth place: D in 29; E In 21; F 211 (before the third quarter of 29, it was in another code form)

Number after the fourth digit: upper style

Number after the bar: color.

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