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A munit is a template of melodic steps combined with an expectation for the size & harmonic quality of the interval they subdivide. For example, in meantone some important munits are "5/4 LL", the "do re mi" munit of 5/4 being divided into two equal parts; "4/3 LLs", which says if you hear two large steps and a small step you expect the outer interval to be 4/3; and "7/5 LLL", which means that if you hear three equal steps in a row you expect the outer interval to be, if not 7/5 specifically, then much less strongly consonant than 4/3.