guest598594 commented on a Page, Dice  -  Apr 16, 2008 
  unset %NumberOfDice
  unset %difficulty
  unset %temp
  unset %botches
  unset %successes
  unset %DiceRolled
  unset %rand
  unset %results
  unset %rerolls
  unset %total
  unset %rerolled

You can simply do:

unset %numberofdice %difficulty %etc

And for the coin flip, I would /help $iif

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