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import java.util.*; import java.util.zip.*; import java.util.List; import java.util.regex.*; import java.util.concurrent.*; import java.util.concurrent.atomic.*; import java.util.concurrent.locks.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.text.*; import javax.swing.table.*; import java.io.*; import java.net.*; import java.lang.reflect.*; import java.lang.ref.*; import java.lang.management.*; import java.security.*; import java.security.spec.*; import java.awt.*; import java.awt.event.*; import java.awt.image.*; import javax.imageio.*; import java.math.*; class main { static Object[] simplyLinkedListToObjectArray(int n, SimplyLinkedList sll) { Object[] array = new Object[n]; for (int i = 0; i < n; i++) { array[i] = sll.head; sll = sll.tail; } return array; } static class SimplyLinkedList { A head; SimplyLinkedList tail; static SimplyLinkedList cons(B head, SimplyLinkedList tail) { SimplyLinkedList l = new SimplyLinkedList(); l.head = head; l.tail = tail; return l; } } }