Obviously, Add could change its template according to the cases:
Add(x, y) ===> Add[AssocOp](x, y)
Add(x, y) + Add(oo,1) ===> Add(Add[AssocOp](x,y), Add[InfinitiesT](oo))
===> Add[InfinitiesT](x,y,oo)
Add's *__new__* constructor could be dispatched to handle specific cases
for these templates.
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