41.  It cleverly uses music of the era as an essential component, just as live music was crucial to the enjoyment of silent movies.

42.  Indeed, winning is an essential component of a master plan, if not the end as Blank sees it.

43.  It turns out that the body makes its own cholesterol, which is an essential component of cell membranes and a key ingredient in hormone manufacture.

44.  One of the true horrors of the Internet is that it makes customer service an essential component of successful business.

45.  Programming talent is now seen as such an essential component of any successful company that some see it as worth fighting over.

46.  Rebar is an essential component in materials used in the construction industry.

47.  That figure should more than double by the end of next year, and emu should have become an essential component of the Australian barbecue.

48.  The ABM treaty has been an essential component of arms control understandings between Washington and Moscow since the Nixon administration.

49.  The ability to do so is an essential component of the human psyche.

50.  The Clinton administration has led an international campaign to crack down on an essential component of the problem, money laundering.