Island 1: 9 roads from 10 to 1; square 2 has 2 roads
Island 2: 8 roads from 11 to 1; square 3 has 3 roads
Island 3: 2 roads from 2 to 3; square 1 has 99 roads
Island 4: 4 roads from 102 to 101; square 1 has 99 roads
