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1) For Bottom-up implementation of L-attributed definition all the semantic actions must be at the end of productions(Postfix SDT).

I think it is true because for BU implementation of L-attributed definition it must be based on LL(1) grammar.and we can convert every LL(1) based SDT into postfix SDT.And if this is not the case then we will get different outputs during BU and TD parsing and this case is not desired in SDT.

please share your views.

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