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Entries beginning with numerals are assigned an A Cutter (.A12-.A19)
and numbered to precede all entries beginning with the letter A.
Because of the infinite range of numbers, choose a Cutter toward the
center of the available span when Cuttering for the first number in
a class. This will allow room for both smaller and larger numbers.
Follow this practice with relatively low numbers since decimal fractions are
filed in numeric order before the number 1.