定义的行和列数，用于描述源和目标之间的传输频率。如果所有来源也是目的地，反之亦然，则存在一个正方形矩阵，并且行和列的数量相同。
Defined number of lines and columns for the description of transport frequencies between sources and destinations. If all sources are also destinations and vice versa, a square matrix exists and the number of columns and lines is identical.
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