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class quaylui {
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	int b[] = new int[26];
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	void quaylui(int i) {
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		for (int k = 97; k <= 100; k++) {	//duyet cac ky tu co ma tu 97 ->122 : a->z
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		for (int k = 97; k <= 122; k++) {	//duyet cac ky tu co ma tu 97 ->122 : a->z
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			b[i] = k;		// b[i] = ma ASCII
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			if (i == 8) {	//Neu du 9 ky tu thi in ra
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				for (int l = 0; l <= i; l++)
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					System.out.printf("%c", b[l]);
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				System.out.print("\n");
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			} else 	//chua du 9 thi lap lai voi b[i+1]
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				quaylui(i + 1);
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		}
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	}
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	public static void main(String[] agrs) {
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		quaylui ql = new quaylui();
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		ql.quaylui(0);
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	}
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}