| type Direction = | |
| | North | |
| | South | |
| | East | |
| | West | |
| type TurnTo = | |
| | R | |
| | L | |
| type Point = { | |
| x : int | |
| y : int | |
| } | |
| type Location = { | |
| dir : Direction | |
| pt : Point | |
| } |
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