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The non-prime numbers between 81 and 87 are 82, 84, 85, and 86.

82 is not prime because it is divisible by 2: 82 divided by 2 equals 41.

84 is not prime because it is divisible by 2: 84 divided by 2 equals 42.

85 is not prime because it is divisible by 5: 85 divided by 5 equals 17.

86 is not prime because it is divisible by 2: 86 divided by 2 equals 43.

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