1.   States in these areas began enacting legislation to prevent the entry of free blacks within their borders.

2.   Such barriers are common in public procurement where standards and rules and regulations can prevent entry by non-national firms.

3.   None of these measures will prevent the entry into the United Kingdom of the genuine immigrant or asylum seeker.

4.   A special licence needs to be obtained before animals can be brought into the United Kingdom, this helps to prevent illegal entry.

5.   American had recently reinforced cockpit doors on all its planes to prevent forced entries.

6.   Additional locks can often prevent easy entry by burglars.

7.   But Gov. Orval E. Faubus called out the National Guard to prevent their entry.

8.   Cockpit doors would have to be strengthened to prevent unauthorized entry, and commuter aircraft also would have to be fitted with secure doors.

9.   Delta and other carriers already have reinforced cockpit doors to prevent forced entry, as required by the Federal Aviation Administration.

10.   He wanted to prevent their entry into Switzerland.