The mathematical structural model of the program which designates the word unit which has defined the state of word as the base is drawn up. Further in details, the digraph is drawn up on the basis of the partial order relation between the program groups of the word unit. Contiguity queue is obtained on the basis of this digraph. In this way, the topological sort which in the contiguity queue which can designates depth priority search as keynote is done. As a result it lines up according to the order which it is possible and changes the program group of the word unit. Because of this, for example it can evade repetition.
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