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该博客介绍了如何解决LeetCode第17题，即根据给定的数字（如2-9）生成对应的电话号码字母组合，不使用递归的方法。文章提供了具体例子和约束条件，并可能探讨了Java中列表操作的某些细节。
Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. Return the answer in any order.
A mapping of digit to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters.
Example 1:
Input: digits = "23"
Output: ["ad","ae","af","bd","be","bf","cd","ce","cf"]
Example 2:
Input: digits = ""
Output: []
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