The development of English into the world's lingua franca suggests that spelling is not an insuperable barrier.

ECONOMIST: The conflict in Georgia

This is not an insuperable problem if pension promises are properly accounted for.

ECONOMIST: Pension sums don��t add up

And there would have to be some deal on the form of the oath MPs take to the Queen... but that would probably not be an insuperable obstacle.

BBC: Numbers game

Poetry is, admittedly, an insuperable problem for quotation compilers.

NEWYORKER: Notable Quotables

In years past Turkey's spotty democracy was often cited to prove a negative: the Turkish case (along with Indonesia's and Malaysia's, also with reservations) showed that Islam did not pose an insuperable barrier to multiparty democracy.

ECONOMIST: The Turkish model

With its passing, a document that was designed -- and proved -- to be an insuperable obstacle to developing and deploying effective protection against missile attack for the American people and their homeland will cease to have that effect.

CENTERFORSECURITYPOLICY: Center For Security Policy

The looming encounter between modern technology and a timeless spiritual tradition might indeed pose an almost insuperable challenge for the latter if Saint Catherine's were located anywhere else.

ECONOMIST: Saint Catherine's monastery

It also underscores the insuperable problems that confront any effort to create an effective international regime banning chemical weapons.

CENTERFORSECURITYPOLICY: Center for Security Policy | Lessons From Iraq About Germany��s Export Policies Or Is ��Nukem�� What Genscher Has In Mind When He Speaks Of ��German Industry��s Good Name��?