| 摘要 |
An extended numerical keyboard (10) provided with four additional number-entry keys: three structure keys (11) and one swap key (12), located next to the matrix of ten digit keys and decimal point key found in conventional numerical keyboards, able to implement a structured input number operation in a way consistent with the oral expression of the number; a decoding method to convert a symbolic representation of the verbal expression of a number into a number; and a coding method to convert a number into a symbolic representation of the verbal expression of the number.
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