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from typing import List

class Solution:

def __init__(self):

self.alphabetPosition = {

'q': 1,

'w': 1,

'e': 1,

'r': 1,

't': 1,

'y': 1,

'u': 1,

'i': 1,

'o': 1,

'p': 1,

'a': 2,

's': 2,

'd': 2,

'f': 2,

'g': 2,

'h': 2,

'j': 2,

'k': 2,

'l': 2,

'z': 3,

'x': 3,

'c': 3,

'v': 3,

'b': 3,

'n': 3,

'm': 3,

}

def findWords(self, words: List[str]) -> List[str]:

result = []

for word in words:

if self.singleRowWord(word.lower()):

result.append(word)

return result

def singleRowWord(self, word: str) -> bool:

row = self.alphabetPosition[word[0]]

for index in range(1, len(word)):

if self.alphabetPosition[word[index]] != row:

return False

return True