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Just to add, Bach in particular often shows disregard for this restriction on fourths in his keyboard music with a lot of counterpoint, thus providing more freedom for contrapuntal inventions (he also freely uses direct 5ths and octaves, even in 2 voices. He does, however, avoid parallelels).
You will see free use of chords with the 5th in the lowest voice and many of these times forming a 4th with the next voice above (ie the "root" of the chord in the second lowest voice).
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