public static void Main()
Console.WriteLine(Solution.CountVowelPermutation(5));
public static int CountVowelPermutation(int n) {
long MOD = Math.Pow(10,9) + 7;
Console.WriteLine("Mod is {0}", MOD);
var vowAnew = (vowE + vowI + vowU) % MOD;
var vowEnew = (vowA + vowI) % MOD;
var vowInew = (vowE + vowO) % MOD;
var vowOnew = (vowI) % MOD;
var vowUnew = (vowO + vowI) % MOD;
var sum = (vowA + vowE + vowI + vowO + vowU);