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choose and union ºÃ°Ý

Set n = Choose(h, "Union(Y, x)", "Union(y1, x)", "Union(y2, x)")
³o¼Ë¬O¦r¦ê"Union(Y, x)", "Union(y1, x)", "Union(y2, x)"
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set n=choose(h,union(y,x),union(y1,x),union(y2,x))
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