These issues are not insuperable for our proposals, but fall beyond the scope of the present paper.
In the event, they encountered no insuperable problems.
However, this is not an insuperable problem if other conditions are right for -er nominal formation.
Things which defeated you a short time ago are no longer insuperable.
These difficulties may or may not be insuperable, but the version under discussion cannot ensure the identity of extended preferences.
And so my conclusion is that these suggested logical difficulties are by no means insuperable.
These limitations are certainly serious, but they did not strike us as insuperable barriers to the exploitation of this unique source for portfolio ratings.
There is here a point of conflict which has so far proved insuperable.
