public static Cons dmerj (Cons x, Cons y) {
  if ( x == null ) return y;
   else if ( y == null ) return x;
   else { Cons front = x;
          if ( ((Comparable) first(x))
                          .compareTo(first(y)) < 0)
             x = rest(x);
            else { front = y;
                   y = rest(y); };
          Cons end = front;
          while ( x != null )
            { if ( y == null ||
                   ((Comparable) first(x))
                          .compareTo(first(y)) < 0)
                 { setrest(end, x);
                   x = rest(x); }
               else { setrest(end, y);
                      y = rest(y); };
              end = rest(end); }
          setrest(end, y);
          return front; } }

What is O()? Stack depth? Conses?

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