Mutual is also often used to refer to a feeling, interest, etc that two people have about a third person or thing: a mutual love of sailing. Some people consider this to be incorrect, and would use common instead. Applied to people, mutual is more or less accepted, as common might suggest inferiority: We met through a mutual friend.
Avoid using mutual if the idea is expressed elsewhere in the sentence, for example by cooperate, each other or share: We shared a love of sailing.
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