Dims = (9,7)
layout = <<EOF
 X  XX   
 X X XX  
X  X   X 
   X X   
  X X  XG
 X  X X  
  X   XX 
EOF
Planks = [ ((0,2) -> (3,2)) , ((5,0)->(5,1)), ((4,5) -> (6,5)), ((2,6) -> (6,6)) ]

