It's common to see a normal examination of the heart notated with the abbreviation S1 S2 NSR, meaning there was a normal "lub," a normal "dub," and a normal sinus rhythm ("NSR"). Some argue that you can't "hear" a normal sinus rhythm, but can only advise the rhythm is regular.

as much dub as a dub could step if a dubstep could step dub

Dub is not a prefix.

Rub-a-Dub-Dub - 1918 was released on:

USA: 20 January 1918

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