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 For any three sets $P$,$Q$ and $R$, $s$ is an element of $(P \bigtriangleup Q)\bigtriangleup R$  if $s$ is in

  1. Exactly one of $P$,$Q$ and $R$
  2. at least one of $P,Q,R$ but not in all three of them at the same time
  3. exactly two of $P,Q$ and $R$  
  4. exactly one of $P,Q$ and $R$ or in all the tree of them.
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