1.   Notice that many such questions merit consideration when you attempt to operationalize a major political variable.

2.   Another major economic variable will be employment.

3.   The major variable was Holtz, who has a history of alienating those who work for him.

4.   To add another major variable to the mix is asking for trouble.

5.   Brace said no matter how advanced rescue techniques become, weather remains a major variable.

6.   That leaves Russia as the major variable in world oil supply.