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- def solution(number_string, store='', word_list=[]):
- if number_string:
- char_list = number_to_letters_dict[number_string[0]]
- else:
- return [store] if is_word(store) else []
- for char in char_list:
- store += char
- word_list += solution(number_string[1:], store)
- return word_list
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