Use the FREQ selection operator when you want to select words based on frequency of occurrence. When used as a source (e.g. "FREQ 5"), FREQ selects words based on their frequency in the entire text. When used as a refinement (e.g. "l.* ; FREQ 5", words are selected according to their number of occurrences in the given list.
You give numbers to use as criteria for frequency selection. The forms are:

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