Character substitution only gets you so far, I got the robot, but eg.
could be you, son, don, mop, sod, pod, sop, lop, bop, won, con, etc...
admittedly, most of those are fairly unlikely, but you get the idea.
When I first tried, I got this far then went off in search of pizza, but I shall attempt again:
If you can read this, you have too much time:
a
c
d
e
f
h
i
m
n
o
r
s
t
u
v
y