Vaughn knew that if her current condition proved permanent, he would have to get a new exec.

Despite a number of attempts at reunification, the split proved permanent.

Jim didn't know whether he would have laughed at them, or started shaking, if they'd proved permanent.

Hobgood put the accent on the word "remain" as though the process would prove permanent.

However, the 12th century initiated a series of unions that would prove permanent.

Similar evidence comes from California and elsewhere; some changes in flora proved permanent .

This move, in fact, proved permanent, as it was never lifted.

These reforms proved largely permanent and modernized the western parts of Germany.

The success of these efforts proved fairly permanent as well.

Two further innovations however were to prove more permanent.