/in/foo.cc:23:5: error: redefinition of 'int cj [51][6]'
   23 | int cj[51][6];
      |     ^~
/in/foo.cc:3:5: note: 'int cj [51][6]' previously declared here
    3 | int cj[51][6];
      |     ^~
/in/foo.cc:24:5: error: redefinition of 'int main()'
   24 | int main()
      |     ^~~~
/in/foo.cc:4:5: note: 'int main()' previously defined here
    4 | int main()
      |     ^~~~