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I mean, wordplay about "jam" and "block" are the "who's on first" of roller derby puns. Remedial Roller Derby: (As mentioned in previous Remedial notes, cuz it's a core element of derby), a unit of play is called a "jam", and the Lead Jammer (the jammer who got out of the pack first) can "call off the jam" (ending it) at any time by repeatedly tapping her hips.
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