foo.cc: In function 'int main()':
foo.cc:18:26: warning: iteration 2 invokes undefined behavior [-Waggressive-loop-optimizations]
   18 |         sum[i] = str[i][0] + str[i][1];
      |                  ~~~~~~~~^
foo.cc:16:23: note: within this loop
   16 |     for (int i = 0; i < 7; i++)
      |                     ~~^~~

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