Filling Af....
A= Af --- > A =  
[[0,1,2]
 [10,11,12]]
 i,j = 0    0 A=0 should be 0
 i,j = 0    1 A=1 should be 1
 i,j = 0    2 A=2 should be 2
 i,j = 1    0 A=10 should be 10
 i,j = 1    1 A=11 should be 11
 i,j = 1    2 A=12 should be 12
 copy construction B(A)
B 0
B 1
B 2
B 10
B 11
B 12
  B2 = A
B2 0
B2 1
B2 2
B2 10
B2 11
B2 12
  F = A
[[0,1,2]
 [10,11,12]]