本文介绍了T9文本输入的原理和实现，该算法通过九宫格键盘输入单次按键来快速输入单词，依赖内置词典找到最可能的匹配。程序需要根据输入的按键序列实时给出最可能的单词前缀，若无匹配则显示'MANUALLY'。
Problem Description
A while ago it was quite cumbersome to create a message for the Short Message Service (SMS) on a mobile phone. This was because you only have nine keys and the alphabet has more than nine letters, so most characters could only be entered by pressing one key several times. For example, if you wanted to type "hello" you had to press key 4 twice, key 3 twice, key 5 three times, again key 5 three times, and finally key 6 three times. This procedure is very tedious and keeps many people from using the Short Message Service.
This led manufacturers of mobile phones to try and find an easier way to enter text on a mobile phone. The solution they developed is called T9 text input. The "9"
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