Some upper bounds of the edge number for two class planar graphs are given. Some sufficient conditions for a planar graph to be class 1 are obtained through these bounds of edge number.

给出了平面图为第一类图的边数的一些上界，并给出了平面图为第一类图的一些充分条件。

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So our brands have used a number of cutting-edge digital marketing platforms.

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This means a number of farms at the edge of the previous area will be placed under restriction.

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