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import java.text.CharacterIterator;
import java.text.StringCharacterIterator;
public class Main {
public static void main(String[] argv) throws Exception {
CharacterIterator it = new StringCharacterIterator("abcd");
// Iterate over the characters in the forward direction
for (char ch = it.first(); ch != CharacterIterator.DONE; ch = it.next()) {
System.out.println(ch);
}
}
}
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