15. Under-thread through its own loop.

16. Two needles penetrate fabric from opposite sides.

17. Two needles working from the same side.

18. Double interlocking loop.

19. Lockstitch.

20. Twist in needle thread.

21. Double twist in needle thread.

22. Twist in shuttle thread.

23. Double twist in shuttle thread.

24. Knot stitch, shuttle thread knotted at every stitch.