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The repeating decimal commonly written as 0.999... represents exactly the same quantity as the number one. Despite having the appearance of representing a smaller number, 0.999... is a symbol for the number 1 in exactly the same way that 0.333... is an equivalent notation for the number represented by the fraction 1 ⁄ 3. [438]
To mark such a thing, so-called "plene" writings with an additional vowel sign repeating the preceding vowel were used, although that never came to be done systematically. A typical plene writing involved a sequence such as (C)V- V (-VC/CV), e.g. πΌπ ama- a for /ama a / < {ama- e } "the mother (ergative case)").