└── Solution.txt


/Solution.txt:
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 1 | class Solution:
 2 |     def countVowelPermutation(self, n: int) -> int:
 3 |         MOD = 10**9 + 7
 4 |         
 5 |         a, e, i, o, u = 1, 1, 1, 1, 1
 6 |         
 7 |         for _ in range(1, n):
 8 |             a_next = e
 9 |             e_next = (a + i) % MOD
10 |             i_next = (a + e + o + u) % MOD
11 |             o_next = (i + u) % MOD
12 |             u_next = a
13 |             
14 |             a, e, i, o, u = a_next, e_next, i_next, o_next, u_next
15 |         
16 |         return (a + e + i + o + u) % MOD


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