If you chose a Structure Ia fragment, identify both the
set-form(s) controlling the pitches and those controlling the durations.
Use the matrices presented in the Ligeti's Die Reihe article.
If you chose a fragment from Le marteau sans maitre, identify the
multiplication (ab, ed, cb, etc.) that is part of the respective domain.
Use the charts borrowed from Lev Koblyakov's book Pierre Boulez - A World
of Harmony.
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