开行列车

(1, 6, 7)

(1, 5, 8)

(1, 2, 9)

(1, 4, 10)

(2, 5)

(2, 6, 8)

(2, 7, 8)

(2, 4, 10)

(2, 9, 10)

(3, 4, 7)

(3, 5, 7)

(3, 8)

(3, 4, 9)

(3, 6, 10)

(3, 7, 10)

(4, 5, 8)

(4, 6, 9)

(5, 7, 9)

(5, 6, 10)