A = 
[[2,0,0,0,0]
 [0,2,0,0,0]
 [0,0,2,0,0]
 [0,0,0,2,0]
 [0,0,0,0,2]]
A = 
[[2,2,2,2,2]
 [2,2,2,2,2]
 [2,2,2,2,2]
 [2,2,2,2,2]
 [2,2,2,2,2]]