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  1. def getSquaresWithNeighbors(board:Board):List[Square] = {
  2.     (for(square <- squares if square.neighbors.nonEmpty) yield square)
  3.         .sortWith((s1, s2) => s1.x < s2.x)
  4.         .sortWith((s1, s2) => s1.y < s2.y)
  5.   }
  6.  
  7.   def getPossibleNeighborValues(square:Square):List[Int] = {
  8.     var possible_neighbor_values: List[Int] = List[Int]()
  9.  
  10.     for (value <- square.values) {
  11.       possible_neighbor_values :+= value + 1
  12.       possible_neighbor_values :+= value - 1
  13.     }
  14.  
  15.     possible_neighbor_values.filter((x: Int) => x > 0 && x <= Puzzle.size).distinct
  16.   }
  17.  
  18.   def getImpossibleNeighborValues(square:Square, neighbor:Square):List[Int] = {
  19.     val possible_neighbor_values:List[Int] = getPossibleNeighborValues(square)
  20.     neighbor.values.diff(possible_neighbor_values)
  21.   }
  22.  
  23.   def resolveImpossibleNeighborValues(board:Board):Board = {
  24.     var temp_board = board
  25.     val squares_with_neighbors = getSquaresWithNeighbors(temp_board)
  26.  
  27.     squares_with_neighbors.foreach((square:Square) => {
  28.       val neighbors = getNeighbours(square)
  29.  
  30.       neighbors.foreach((neighbor:Square) => {
  31.         temp_board = temp_board.replaceSquare(
  32.           neighbor.removeSolution(getImpossibleNeighborValues(square, neighbor))
  33.         )
  34.       })
  35.     })
  36.  
  37.     temp_board
  38.   }
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