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Abacus is a counting device
with a long history. It is
essentially a frame mounted
with rods along which beads
can be moved. There are many
versions of the device but
the abacus as we know it
today was invented in China
around 1200 A.D. The Chinese
abacus, called suan pan has
2 beads above a middle
divider called a beam and 5
beads below.
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