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Here, the nonterminal T can generate all strings with more a's than b's, the nonterminal U generates all strings with more b's than a's and the nonterminal V generates all strings with an equal number of a's and b's. For example, the sentence:. A formal grammar is essentially a set of production rules that describe all possible strings in a given formal language. This grammar is regular : no rule has more than one nonterminal in its right-hand side, and each of these nonterminals is at the same end of the right-hand side. Such a grammar has long lists of words, and also rules on what types of words can be added in what order.