anchor.diff:  				 	Vertex#{row := Row - 1},
   					Vertex#{col := Col + 1},
   					Vertex#{row := Row + 1},
  -					Vertex#{row := Col - 1}
  +					Vertex#{col := Col - 1}
   			 	],
   	case digraph:vertex(MapGraph, Vertex) of
   		false ->
  
positive.code: 						true ->
  							ok
  					end
  			end
  	end,
  	populate_edges(MapGraph, Dims, Vertex, Neighbors).
  
  
negative.code: 
  populate_edges(MapGraph, _, _, []) ->
  	MapGraph;
  populate_edges(MapGraph, #{height := Height, width := Width} = Dims, Vertex, [Neighbor|Neighbors]) ->
  	NeighborRow = maps:get(row, Neighbor),
  	NeighborCol = maps:get(col, Neighbor),
  	case NeighborRow > 0 andalso NeighborCol > 0 andalso 
  			 NeighborRow < Height andalso NeighborCol < Width of
  		true ->
  			case digraph:vertex(MapGraph, Neighbor) of
  				false ->
  