claim: Ekta Kapoor worked on an Indian historical romance film.
evidence: An operator precedence grammar is a kind of grammar for formal languages .. grammar. Formal grammar. Technically , an operator precedence grammar is a context-free grammar that has the property -LRB- among others -RRB-. grammar. Formal grammar. context-free grammar. context-free grammar. that no production has either an empty right-hand side or two adjacent nonterminals in its. right-hand side .. These properties allow precedence relations to be. relations. Relation ( mathematics ). defined between the terminals of the grammar .. grammar. Formal grammar. A parser that exploits these relations is considerably simpler than more general-purpose parsers such as LALR parsers .. relations. Relation ( mathematics ). parser that exploits these relations. Operator-precedence parser. Operator-precedence parsers can be constructed for a large class of context-free grammars .