1.   The problem involves classical physics, as opposed to quantum physics.

2.   They locate the various strands in feminist thinking, and show the conceptual problems involved in combining them.

3.   It is rather like the problem of litter louts, one dropped piece of paper is harmless in itself, but the problem involves the total volume of litter!

4.   On four separate occasions when the problems involved finance, Willi had somehow managed to wheedle an emergency sum from the Gemeinderat.

5.   Another problem involves the ability to diagnose a case of Lyme disease accurately in a vaccinated person.

6.   Another problem involves the Federal Reserve.

7.   Another potential problem involves the number of flights granted to Nippon Cargo Airlines Co.

8.   Another problem involves adults hiring youths to illegally peddle wares door to door by using deceptive sales practices.

9.   Another problem involves undiagnosed patients.