1.   A small cottage industry of biotechnology firms has sprung up to investigate this, using a variety of methods.

2.   But if you want a great apple pie, use a variety of apples.

3.   Calcium is determined using a variety of other reagents and most reliably by using atomic absorption spectrophotometry.

4.   Commercially pure ethanol is produced using a variety of chemical reactions to eliminate the water.

5.   Computers use a variety of formats for recorded sound.

6.   In Bloomington, Ill., police use a variety of gang definitions, cobbled together from various state and local edicts.

7.   It uses a variety of infrared sensors to determine the location and position of objects that are to be lifted and moved.

8.   Nineteen had used only one drug prior to heroin use, principally cannabis, the rest using a variety of drug combinations.

9.   Papermakers use a variety of synthetic resin, starch and organic gelatin sizes in the manufacture of watercolour papers.

10.   Pressures and temperatures in the Jovian atmosphere have largely been determined by spacecraft, using a variety of techniques.