mb event system 2 Sections EventSystems Doc
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Def union-deq(A;B;a;b) == <sumdeq(a;b),sum-deq(A;B;a;b)>

is mentioned by

Def KindDeq == union-deq(IdLnkId;Id;product-deq(IdLnk;Id;IdLnkDeq;IdDeq);IdDeq)[Kind-deq]

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mb event system 2 Sections EventSystems Doc