# Start: 
(0,0)
# End:  
(3,3)
# Cells:
(0,0)2(1,0)(0,1)
(1,0)2(0,0)(2,0)
(2,0)1(1,0)
(0,1)2(1,1)(0,0)
(1,1)3(0,1)(2,1)(1,2)
(2,1)2(1,1)(2,2)
(2,2)1(2,1)
(1,2)2(1,1)(0,2)
(0,2)2(1,2)(0,3)
(0,3)2(0,2)(1,3)
(1,3)2(0,3)(2,3)
(2,3)2(1,3)(3,3)
(3,3)2(2,3)(3,2)
(3,2)2(3,1)(3,3)
(3,1)2(3,2)(3,0)
(3,0)1(3,1)