1.   It is a philosophical problem, a fact recognised by scientists themselves on both sides of the argument.

2.   Organic farming frequently encounters such philosophical problems.

3.   Philosophy Modules have been developed to introduce students to the major philosophical problems.

4.   There appears to be a philosophical problem here.

5.   There are security issues, there are philosophical problems that I have with it.

6.   The philosophical problems of chance and of free will are closely related.

7.   The paper is not so much about bats as about the philosophical problem of imagining what it is like to be anything that we are not.

8.   I was initially troubled by a philosophical problem.

9.   Ames had few philosophical problems with the political system in the United States.