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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)"
¥ÎSET´N¥X¿ù
set n=choose(h,union(y,x),union(y1,x),union(y2,x))
°ò¥»»yªk¬O¨S¿ù,¦ý¬O¤@¥¹x,y,y1,y2¨ä¤¤¤S¤@Ó¬Onothing¤]·|¥X¿ù |
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