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<<X1:1, X2:1, X3:1, _:1>> = <<X:4>>,
TenF = X1 band X2 bor X1 band bnot X2 band X3,
X + (1 - TenF) * $0 + TenF * ($A - 10)
hexlify(Binary) ->
<< <<?TOHEX(X), ?TOHEX(Y)>> || <<X:4, Y:4>> <= Binary>>.
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