I notice grinder considered adder, I am not sure that I agree to arbitarily reaping homework nodes, carefull replies (such as demonstrated by dws here) can turn a simple homework question into a deeper learning exercise, and some problems are interesting enough that people will want to solve them, adder seems to fit that category. However having goofed on this node because I hadn't seen the earlier node I am wondering if consideration is perhaps a suitable method to give the unwary a heads up...
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