Two triads are said to be Pm,n-related if m pitch classes move by a semitone, while n pitch classes move by a whole tone, the rest of the pitch classes being identical.
Based on the original paper of Douthett and Steinbach :
1. Douthett, Jack, and Peter Steinbach. 1998. “Parsimonious Graphs: A Study in Parsimony, Contextual Transformations, and Modes of Limited Transposition.” Journal of Music Theory 42 (2): 241–263.
Visualization and code by Alexandre Popoff.
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