**Category: Collections-Unordered**

Superclass: HashedCollection- I am the typical set object; I also known how to do arithmetic on my instances.

awful ST-80 compatibility hacks (instance)

comparing (instance)

Compute the set intersection of the receiver and aSet.

**+ aSet**

Compute the set union of the receiver and aSet.

**- aSet**

Compute the set difference of the receiver and aSet.

Tries to see if anObject exists as an indexed variable. As soon as nil or anObject is found, the index of that slot is answered

Answer whether the receiver is a strict subset of aSet

**<= aSet**

Answer whether the receiver is a subset of aSet

**> aSet**

Answer whether the receiver is a strict superset of aSet

**>= aSet**

Answer whether the receiver is a superset of aSet