30 250000 -1000000 1000000
Case #1: 1
0 0 -> R
Case #2: 5
0 0 -> E 1 1
1 0 -> E 2 1
2 0 -> E 3 1
3 0 -> E -1 1
-1 0 -> R
Case #3: 3
0 0 -> E 1 1
0 1 -> R
1 0 -> W 0 1