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Diminished Seconds

The following intervals are diminished seconds because each interval is a second apart and contains exactly zero half steps.  A diminished second is smaller than a minor second.

Noteworthy:  A diminished second is enharmonic to a perfect unison.

Augmented Seconds

The following intervals are augmented seconds because the two notes are a second apart and contain exactly three half steps.  An augmented second is larger than a major second.

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