$s_2$

$t_2$

$\left(s_1\mathrm{,}{s}_3\right)$

(11, 5)

(5, −2)

$\left(t_1\mathrm{,}{s}_3\right)$

(7, 2)

(7, 1)

$\left(s_1\mathrm{,}{t}_3\right)$

(9, 1)

(8, 1)

$\left(t_1\mathrm{,}{t}_3\right)$

(10, 6)

(6, 0)