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ciml - 1:10 pm on Aug 31, 2002 (gmt 0)
That may be just because the one word phrase is more cometitive; even with the lack of weight for solutions that the others have, it's so overwhelmingly optimised (including backlinks) for the two word phrase that it gets over the 'barrier' (whatever that is).
Good point squared. Quite often I see this pattern, and generally it's a one word phrase.