TABLE OF SUBSTITUTES.
Sub for as in

a o what
y i hymn
e a there
c s cite
e a freight
c k cap
i e police
ch sh machine
i e sir
ch k chord
o u son
g j cage
o oo to
n ng rink
o oo would
s z rose
o a corn
s sh sugar
o u worm
x gz examine
u oo pull
gh f laugh
u oo rude
ph f sylph
y i my
qu k pique
qu kw quick