foo.cc: In function 'int main()':
foo.cc:8:38: error: lvalue required as left operand of assignment
    8 |  if(b=1||b=3||b=5||b=7||b=8||b=10||b=12)
      |                                      ^~
foo.cc:10:27: error: lvalue required as left operand of assignment
   10 |  else if(b=4||b=6||b=9||b=11)
      |                           ^~

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