‘Cat’ is a word which occurs in ‘cattle’, but it does not occur as a word; ‘1 + 2’ is a term which occurs in ‘1 + 2.3’, but it does not occur as a term. All such occurrences of expressions might be said to be accidental, since they are accidents of how the syntax of the language happens to be realized.
KeywordsOperator Block Principal Production Successor Type Null String Accidental Occurrence
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