abacus as the traditional calculation tool.

The numbers one, two, and three are all represented by vertical bars. This can cause confusion when they appear next to each other. Standard Chinese ideographs are often used in this situation to avoid ambiguity. For example, "21" is written as "??" instead of "??" which can be confused with "3" ?. The first character of such sequences is usually represented by the Suzhou numeral, while the second character is represented by the Chinese ideograph.

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