only least significant bit overlaps
Is quite different to just odd or even:
$x = 0b1111_1110_1101_1100_1011_1010_1001_1000_0111_0110_0101_0100_001
$y = 0b0000_0001_0010_0011_0100_0101_0110_0111_1000_1001_1010_1011_110
printf "%064b\n", $x & $y;;
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