Can any one solve this error ?

Can any one solve this error?I am doing it in Java Permutation with repetition [code] public class Test { public static void main(String... args) { // Limit imposed by Integer.toString(int i, int radix) which is used // for the purpose of this demo. final String chars = "0123456789abcdefghijklmnopqrstuvwxyz"; int wordLength = 3; char[] alphabet = { 'a', 'b', 'c' }; for (int i = 0; i < Math.pow(wordLength, alphabet.length); i++) { String str = Integer.toString(i, alphabet.length); String result = ""; while (result.length() + str.length() < wordLength) result += alphabet[0]; for (char c : str.toCharArray()) result += alphabet[chars.indexOf(c)]; System.out.println(result); } } } [/code] Output would be: aaa aab aac aba abb abc aca acb acc baa bab bac bba bbb bbc bca bcb bcc caa cab cac cba cbb cbc cca ccb ccc Thank you

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