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Imnutable set backed by a hash set.
public class immutable hash set[readonly value element type]
extends base hash set[element type]
implements immutable set[element type]
protected immutable hash set(equivalence with hash[element type] equivalence, set state[element type] state)
super(equivalence, state)
state • writable = false
implement immutable set[element type] frozen copy()
return this
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