Division No. 1.
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Division No. 3 (more elaborate).
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3. Example of Sol-Fa, 16th and 17th centuries, see p. [35]. Lear I, ii, 137.
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The augmented fourths formed by the notes fa and mi, marked with x, are the mi contra fa, which diabolus est, or 'is the divider,' see p. [36].