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One was a mathematical tree using fractions to show how quickly people move through parts of a room . A graphic presentation using symbols to show the step-by-step sequence of operations , activities , or procedures . Decimal Classification uses numerals to represent subjects . As recently as 1915 in Africa , the German army used bees to delay the advance of British troops . " Eventually , we 'd like to add in data about past fire suppression efforts and other land use characteristics to develop some very reliable predictive tools .