22 = playerctl play-pause
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（二）其他行李，应当在行李交还前或者交还时提交。。safew官方版本下载对此有专业解读
1 & x_1 - x_0 & x_1(x_1 - x_0)& \dots & x_1^{n-1}(x_1 - x_0)\\