import java.util.*;

public class Ex15Clump {

	public static void clump(ArrayList<String> list) {
		for (int i = 0; i < list.size(); i++) {
			if (i + 1 < list.size()) {
				// Strategy: keep one, remove one, replace the one you kept
				String str1 = list.get(i);
				String str2 = list.remove(i+1);
				String strCombined = "(" + str1 + " " + str2 + ")"; 
				list.set(i, strCombined);
			}
		}
	}

	public static void main(String[] args) {
		String[] strs = { "four", "score", "and", "seven", "years", "ago", "our" }; 
		ArrayList<String> list = new ArrayList<String>(
			Arrays.asList(strs)
		);
		System.out.println(list.toString());
		clump(list);
		System.out.println(list.toString());
	}

}