foo.cc: In function 'int main()':
foo.cc:14:14: error: 'aq' was not declared in this scope; did you mean 'a2'?
   14 |  cin>>a1>>a2;aq
      |              ^~
      |              a2
foo.cc:15:15: error: 'i' was not declared in this scope
   15 |  for(int i=a1;i<=a2;i++)
      |               ^

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