5
   5  10
   5  10  15
   5  10  15  20
   5  10  15  20  25
   5  10  15  20  25  30
   5  10  15  20  25  30  35
   5  10  15  20  25  30  35  40
   5  10  15  20  25  30  35  40  45
   5  10  15  20  25  30  35  40  45  50
  10  15  20  25  30  35  40  45  50
  15  20  25  30  35  40  45  50
  20  25  30  35  40  45  50
  25  30  35  40  45  50
  30  35  40  45  50
  35  40  45  50
  40  45  50
  45  50
  50

Empty list! 
   5
  10   5
  15  10   5
  20  15  10   5
  25  20  15  10   5
  30  25  20  15  10   5
  35  30  25  20  15  10   5
  40  35  30  25  20  15  10   5
  45  40  35  30  25  20  15  10   5
  50  45  40  35  30  25  20  15  10   5
  50  45  40  35  30  25  20  15  10
  50  45  40  35  30  25  20  15
  50  45  40  35  30  25  20
  50  45  40  35  30  25
  50  45  40  35  30
  50  45  40  35
  50  45  40
  50  45
  50

Empty list! 
  10
  20  10
  30  20  10
  40  30  20  10
  50  40  30  20  10
  60  50  40  30  20  10
  70  60  50  40  30  20  10
  80  70  60  50  40  30  20  10
  90  80  70  60  50  40  30  20  10
 100  90  80  70  60  50  40  30  20  10
search 5 not found
search 10 found 10
search 15 not found
search 20 found 20
search 25 not found
search 30 found 30
search 35 not found
search 40 found 40
search 45 not found
search 50 found 50