11
17 88 69 100 43 78 88 91 76 100 86
20
bridge 3 9
bridge 3 7
bridge 2 9
bridge 5 8
bridge 5 6
bridge 6 9
bridge 5 4
excursion 9 5
bridge 1 8
bridge 5 11
excursion 3 6
excursion 8 9
excursion 7 2
excursion 11 1
excursion 7 8
excursion 1 9
excursion 5 9
bridge 4 10
excursion 7 2
excursion 2 9