If the language is finite then it is possible to simply list the valid sentences.

A grammar is simply a declarative statement of what forms a valid sentence.

One approach to this problem is to develop a parser that selects the words that can combine to form valid sentences.

For example, the conjunction of the Gödel sentence and any logically valid sentence will have this property.

Grammar rules are traditionally viewed in computational linguistics as defining the valid sentences in a language.

In fact, the class of valid sentences over finite models is not recursively enumerable (though it is co-recursively enumerable).

The set of such formulas is a proper subset of the set of logically valid sentences of predicate logic (which are the sentences that are true in every model).

Then we have the useful theorem that a formula is a valid sentence of classical logic if and only if its value is 1 for every valuation-that is, for any assignment of values to its variables.

It is not unique; there are infinitely many statements in the language of the theory that share the property of being true but unprovable.For example, the conjunction of the Gödel sentence and any logically valid sentence will have this property.

Some courses on compiler construction will include a simplified grammar of a spoken language that can be used to form a valid sentence for the purposes of providing students with an analogy to help them understand how grammar works for programming languages.

The Constitution of Russia, in article 49, states that "Everyone charged with a crime shall be considered not guilty until his or her guilt has been proven in conformity with the federal law and has been established by the valid sentence of a court of law".

According to the law, legal proceedings in cases involving a three-year or two-year prison sentence would be dropped or stayed respectively; valid sentences would be remitted; and sentences for serious crimes would be lowered (including the abolition of capital punishment in favour of a 25-year prison sentence).