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28 7 28 8 28 9 29 0 29 1 29 2 29 3 29 4 29 5 29 6 29 7 29 8 29 9 30 0 30 1 30 2 1481 1480 1479 1478 1477 1476 1475 1474 1473 1472 1471 1470 1469 1468 1467

= Free Coordinate    = Occupied(Single Region)     = Occupied (Var Region)     = Center of the grid