1.   A major part of the argument against integration was based on the reaction of teachers rather than any theoretical problems.

2.   But that development involved the solution of theoretical problems and was not to be achieved without considerable theoretical labour.

3.   But this immediately raises two theoretical problems.

4.   Here we return to the theoretical problem of how the other can be articulated as such.

5.   There are, however, a few theoretical problems.

6.   There is, however, a theoretical problem.

7.   Thus, much of sociological theorising consists of commentaries upon commentaries on other theories rather than trying to bring data systematically to bear upon theoretical problems.

8.   The potential for malignant transformation at the site of implantation as a result of chronic irritation from the metal remains a theoretical problem worthy of consideration.

9.   While this is often true, we must recognise that there are several quite serious theoretical problems that should be considered.

10.   Aside from this theoretical problem, Craft says, are more practical ones.