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1101001 1101001 1101001 1101001 1101001 1101001 1101001

0000001 0000010 0000100 0001000 0010000 0100000 1000000

1101000 1101011 1101101 1100001 1111001 1001001 0101001

The XOR binary operation

0

0

1

1

0

1

1

0

0 xor 0 = 0

0 xor 1 = 1

1 xor 0 = 1

1 xor 1 = 0

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The XOR operation truth table is shown here. If you perform an exclusive OR operation on two zeroes, the result is zero. A zero XORed with a one yields one. A one XORed with zero yields one. And a one XORed with a one yields a zero. If you perform an XOR on the top number (1101001) with one of the middle numbers (like 0000100) you get one of the seven adjacents that differ from 1101001 by one digit only. (1101101)