The quartet distance between two binary trees T1 and T2 is the number of quartets consistent with only one tree. Formally, d_\textrm{q}(T_1, T_2) = 2\binom{n}{4} - 2q(T_1, T_2), where q(T_1, T_2) is the number of quartets shared by T_1 and T_2.
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