21.   Now some women are using the concept to arrange their makeup.

22.   Other owners have thought about using the concept but say they have little shot of gaining concessions from players and agents.

23.   Reilly has tried to find concepts being used in Washington and St. Louis that may best fit his personnel in Dallas.

24.   The concept had been used on hands and to reinforce joints on polio patients but never in the elbow, never on a pitcher.

25.   The concept has been used several times in New York City and around the country.

26.   The method they are studying uses a concept that originated more than two centuries ago.

27.   The two also used a concept called porous pavers, or pavement that allows water to seep through.

28.   They also use concepts from ancient Chinese medicine that underlie the martial arts, chiefly a belief in the unity of opposites.

29.   To explore this question, the researchers used the concept of vowel space, a standard conceptual framework for studying the sounds of a language.

30.   Using a concept called sun-synchronous navigation, the machine would keep moving to remain in sunlight.