41.   Ostrofsky said that not all the vendors who participate understand the concept.

42.   People are beginning to understand the concepts of a market, rights and profit potential.

43.   Sexpert Ruth Westheimer, for example, was offended by the request to write a book until she understood the concept.

44.   Some workers understand the concept, but never earn the chisel.

45.   The guys at the office never understood the concept of day velvet.

46.   The kids are simply too young to understand the concept.

47.   The Islamic Cultural Center is, however, the ideal place to understand the concept of qiblah, or orientation toward Mecca.

48.   The harsh attacks also suggest that while North Korea is a formidable negotiator, it has yet to understand the concept of public relations.

49.   The student Lemke said that he understood the concept.

50.   The rest of the world understands this concept implicitly, even if Americans do not.