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Interchange: counterexample

S00 S01 S02 S03
  $\delta$ $\downarrow$  $\delta$ $\downarrow$  $\delta$ $\downarrow$ 
S10 S11 S12 S13
  $\delta$ $\downarrow$  $\delta$ $\downarrow$  $\delta$ $\downarrow$ 
S20 S21 S22 S23
  $\delta$ $\downarrow$  $\delta$ $\downarrow$  $\delta$ $\downarrow$ 
S30 S31 S32 S33

\fbox{\begin{minipage}{6em}{\tt\begin{tabbing}
for $I_1$\space = 0 to 3 do\\
~~...
...[$I_1$ ,$I_2$ ] := A[$I_1 + 1$ ,$I_2 - 1$ ] + ...
\end{tabbing}}\end{minipage}}



 
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