_Eau_ in beau; and _ew_ in sew.

20. _How many Substitutes has o short?_
One.

21. _What is it?_
_A_ in what.

22. _How many Substitutes has u long?_
One.

23. _What is it?_
_Ew_ in new.

24. _How many Substitutes has u short?_
Three.

25. _What are they?_
_E_ in her; _i_ in sir; and _o_ in son.

26. _How many Substitutes has u medial?_
One.

27. _What is it?_
_O_ in wolf.

28. _How many Substitutes has F?_
Two.

29. _What are they?_