How do you Know if a grammar is an operator precedence grammar?

The grammar is said to be operator precedence grammar, if its right hand side of its production should not have the Empty production or two non-terminal should not be adjacent to each other, then we call it as operator precedence grammar The grammar is said to be operator precedence grammar, if its right hand side of its production should not have the Empty production or two non-terminal should not be adjacent to each other, then we call it as operator precedence grammar