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Published online by Cambridge University Press: 11 August 2014
In a recent note (Bizley, 1960) the writer described a device which simplifies the solution of certain derangement problems. The present note explains and illustrates another device in combinatorial work (and hence in probability) having potentialities that do not seem to be well known. It is useful in tackling problems concerned with the choice of objects from an array when restrictions are placed upon the relative positions of those to be chosen, and it has applications to runs of consecutive events.