systema ( συστεμα )
(Greek: "composition", "system", plural: systemata [ συστεματα ] )
[adapted by Joe Monzo, from John Chalmers, Divisions of the Tetrachord]
Complex of tetrachords and whole tones, i.e.:
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the greater perfect system (or "greater complete system", συστεμα τελειον μειζον [systema teleion meizon])
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the lesser perfect system συστεμα τελειον ελαττον [systema teleion elatton])
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their union, the changeless system συστεμα αμεταβολον [systema ametabolon]) or perfect immutable system συστεμα τελειον αμεταβολον [systema teleion ametabolon]).
