21.  The match, which organizers said Tuesday will be played in Varese, is a rare one on foreign soil for Libya.

22.  The mistake was a rare one on a day when Love was beginning to feel the confidence of playing in a major championship after already having won one.

23.  The problem, according to Lou Jacobs, president of the paleontology society, is distinguishing between the many common invertebrate fossils and a few rare vertebrate ones.

24.  The ultimate goal is to collect all the numbers of the engines in operation, but there is joy, too, in simply spying a rare one.

25.  The victory was a rare one for Fuhr over the Capitals.