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A phenomenon where the relative pronoun and the verb "to be" are removed from certain relative clauses.

Whiz-deletion is a type of which removes the relative pronoun and the verb be from certain .

The schoolyard was noisy with children who were running around. [explicit]

The schoolyard was noisy with children who were running around. [reduced by whiz-deletion]

The term is a humorous reference to the fact that most start with wh (who, which, etc.) and that is is a very common for of be, hence wh + is deletion.