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**= aHashedCollection**- Returns true if the two sets have the same membership, false if not
**capacity**- Answer how many elements the receiver can hold before having to grow.
**hash**- Return the hash code for the members of the set. Since order is unimportant, we use a commutative operator to compute the hash value.
**includes: anObject**- Answer whether the receiver contains an instance of anObject.
**isEmpty**- Answer whether the receiver is empty.
**occurrencesOf: anObject**- Return the number of occurrences of anObject. Since we're a set, this is either 0 or 1. Nil is never directly in the set, so we special case it (the result is always 1).
**size**- Answer the receiver's size