Various types of early computing devices. Fig 3: A late Roman abacus; Fig 4: Korean computing rods; Fig 5: A Japanese ruled 'Sangi' board; Fig 6: A modern Chinese abacus.

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Keywords: 3, 4, 5, 6, abacus, abacus., board, calculations, chinese, computing, design, devices, devices., early, fig, japanese, korean, late, modern, rods, roman, ruled, sangi, types