Elemental theory to solve

7 steps to solve problem

     1 list up info, in question    
      2 check each info true or not
      3 solve from solveable part of question 
      4 prepair all possible hypothesis
              truth findable, in all hypothesis 
      5 check false hypothesis 
                  ( if we remain reason why hypothesis false, that helps readers)
      6 choose hypothesis
         all theory, to certificate hypothesis, are true
      7 choose hypothesis
        hypothesis without any contradiction