Four color theorem explained by electrical operational procedures?

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In human reasoning and multi-modal information processing, the diagrams offer a visual clarity in examining spatial constraints. Special diagrams like transitions maps are introduced for assisting the elaboration of operational procedures and for helping the training of operators. Adding visual-logic weights like values, colors or level curves, the diagrams assist better in recognizing conditioned inferences and in elaborating correctly procedures. The transitions maps extend the Euler-Venn diagrams and concur to an explanation of the four-color theorem.