7. A computer implemented method as in claim 1 , wherein said distinction model is a planar diagram describing the underlying said distinction: the boundary is a shorthand of a closed line without leakage; the indications and counter-indication are the two sides interconnected by said boundary; and the frame is a line that delimits the distinction model as a whole.
9. A computer implemented method as in claim 7 , wherein the boundary, indication, counter-indication and frame of said distinction model are labelled by the respective specialized words, identifiers or symbols of the underlying said distinction.