...

For ,

Interchanged, skewed loop:

 for k   := 0 to 8 do

  for k   :=    to    do

S: A[k  ,k  -k  ] := A[k  -1,k  -k  ]+A[k  ,k  -k  -1]

That is,

 for k   := 0 to    do

  for k   :=    to    do

S: A[k  ,k  -k  ] := A[k  -1,k  -k  ]+A[k  ,k  -k  -1]