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a4(A4)

2 layers (no wheel)(2层（无轮）) 3 layers (no wheel)(3层（无轮）) 4 layers (no wheel)(4层（无轮）) 4 layers (with wheels)(4层（有轮）) 5 layers (with wheels)(5层（有轮）) 6 layers (with wheels)(6层（有轮）) 7 layers (with wheels)(7层（有轮）) 8 layers (with wheels)(8层（有轮）)