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First, what is the pros and cons, the left and right wheels, and the wheel of heaven and earth?
Positive and negative edition: A single card has AB sides, A and B are each a separate edition for positive and negative editions;
Left and right rounds: A left B right side row of a version of the left and right rounds;
World round: A round on the bottom of a total of a version of the world wheel;
Or:
1. The pros and cons are two versions, one is positive, and the other is...
2. The left and right rounds are also called self-reviewed editions.
3. The wheel of heaven and earth, the paper is used as a mouthpiece, one on top of the other, head-to-head or foot-to-foot.
It is customary to say that if it is the imposition, it is the difference between positive and negative printing, self-turnover, and rolling over.