Problems are explicit and complete spethe set of permissible moves or actions that can be done during problem solution is known as of the initial and goal states, whereas problems are when states, operators, or both that may be vaguely specified.

The conceptual problems are explicit and complete. The set of allowed movements or actions that can be performed during the solution of the problem is known as CPS (_Creative problem solving). ification of the initial and objective states, while judging does not benefit the problems are when the states, operators or both can be vaguely specified.  

answer; i believe that the correct answer is ( rivers);

this can !    

- jack watson