code     prod_a      prod_b     flag
123      MS          MS         to be checked
123      HS          MS         more than 1 prod
123      MS          HS         to be checked
123      HS          MS         more than 1 prod
123      MS          MS         to be checked

code     prod_a      prod_b     flag               final_flag
123      MS          MS         to be checked      matched
123      HS          MS         more than 1 prod   more than 1 prod
123      MS          HS         to be checked      not matched
123      HS          MS         more than 1 prod   more than 1 prod
123      MS          MS         to be checked      matched