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in this class I will teach elimination of useless production use their symbols eliminating of useless symbols in the grammar okay what does first offer what you mean by eliminating useless symbols there is nothing but a variable a non-terminal needs to be tense - okay a single terminal or set of terminal so only a terminals a non terminal s tends to a terminal it is called useful productions it is called useful productions other things we have to replace as in use this production here is that first step one are playing lemma one nothing but are playing lemma one has nothing but we have to find out we have to find out variable means non terminal this one non terminal capital letters variables non terminal is tending to terminals okay this I will start with cold we knew V productions okay world.we is for first eight worldly is nothing empty folder is empty anubias here in this transaction we will get useful productions that is a tends to a this is a tending to a it is a useful production
