It's all about similarity!
Compare A and B on attribute level with similarity function: $sim_i = sim($att_A_i, $att_B_i), similarity values are between 0 and 1 (0.0 is no similarity at all; 1.0 is equality)
The overall similarity between A and B is the mean value of their attribute's similarities: $sim_A_B = ($sim_1 + ... + $sim_n) / n
$sim_You_I = 1.0
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