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E.1.4 SIG1

spec
Sig1[Elem] =
free
{
type
Set[Elem] ::=
{} | {|__|}(Elem) | __ union __(Set[Elem]; Set[Elem])
op
__ union __ : Set[Elem] × Set[Elem]   ->   Set[Elem], assocunit  {} 
}

CoFI Document: CASL/Summary --Version 0.99-- 21 April 1998.
Comments to cofi-language@brics.dk

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