1.   Gingival hyperplasia is a frequent occurrence, especially in children and young adults.

2.   However, complex eigenvalues and vectors are of frequent occurrence, and require special consideration.

3.   Scraps in the playground are a pretty frequent occurrence.

4.   There is a sound reason for rewording that clause, because that is too frequent an occurrence in day-to-day life in prison.

5.   Worse, a spokesman for the Treasury implies this is a frequent occurrence.

6.   The frequent occurrence of earthquakes in the area means that the buildings must be specifically designed to withstand the force.

7.   Further studies need to be carried out to determine whether the finding of similar strains of H pylori in different members of the same family is a frequent occurrence.

8.   But if you pay too much in sales taxes, a fairly frequent occurrence because of retailer confusion about the complex law, the response is far different.

9.   In a frequent occurrence for Smits, the Pacer center fell prey to early foul trouble, committing two fouls less than four minutes into the game.

10.   Sharing music files over the Internet began as a grass-roots movement, a frequent occurrence in the digital world.