_Ce_ in ocean; _ci_ in social; _si_ in mansion; _ti_ in motion;
_ch_ in chaise; and _s_ in sugar.

50. _How many Substitutes has Zh?_
Four.

51. _What are they?_
_Si_ in fusion; _zi_ in brazier; _z_ in azure; and _s_ in rasure.

52. _How many substitutes has Ng?_
One.

53. _What is it?_
N generally before palate sounds; as, conquer, etc.

54. _What letters have no Substitutes?_
B, D, G, H, L, M, N, P, and R.

55. _What combinations have no Substitutes?_
Th and Wh.

56. _Why is X never doubled?_
It already represents the sounds of K and S.

57. _What letter ends no English word?_
J.