Kirkman's schoolgirl problem
(botany) A species of legume, Caragana arborescens native to Siberia, parts of China and neighboring Mongolia and Kazakhstan.
Coloured with carmine.
plural of catess
(mathematics) A problem in combinatorics, in which 15 schoolgirls go walking three abreast for seven days in succession, and must be arranged so that no two walk abreast more than once.
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