( q t + 1 1 − t ) ( s 6 t 6 + q s 4 t 6 + s 4 t 4 + q s 2 t 5 + q s 2 t 4 + q 2 t 5 + s 2 t 3 + s 2 t 2 + q t 3 + q t 2 + 1 ) {\displaystyle \left({\frac {{q}{t}+1}{1-t}}\right)(s^{6}t^{6}+{q}s^{4}t^{6}+s^{4}t^{4}+{q}s^{2}t^{5}+{q}s^{2}t^{4}+q^{2}t^{5}+s^{2}t^{3}+s^{2}t^{2}+{q}t^{3}+{q}t^{2}+1)}
