19 teams played 1 game. The first three are the Los Angeles Rams and the Pittsburgh Steelers 4 times and the Washington Redskins on November 4, 1990.

most+yards+per+game+allowed+by+a+defense+this+season+;+minimum+400+yards+per+ game
Interpreted as:
most+yards+per+game+allowed+by+a+defense+this+season+;+minimum+400+yards+per+ regular-season game

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