Unexpected Behaviour of ArrayList

import java.util.*; class ArrayListDemo2 { public static void main(String args[]) { ArrayList al=new ArrayList(); al.add("one"); al.add("two"); al.add("three"); al.add("four"); for(int i=0;i

Expected Output:-

one two three four

But I got

one three

What is the reason for this output? How to get my expected output?

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