DanielH: yes, yes, yes; no, no, yes; no, no, yes, no.
MTC: yes, yes, yes, no, no, yes, no, no, yes, no.
Koans
Yes:
raven
0
1
2
3
4
5
6
7
8
9
a0
a1
00
aa
bb
abc
def
qwerty
raven0
araven
a
b
c
d
10
cba
aaa
bbb
000
100
e
f
g
h
qwerty0
aenrv
vrnea
nevar
wtsrnkiiged0
writing0
11
111
raven00
12
132
testingareallylongwordheretoseeifyouarebanningcertainletterclusterstoo
abcdefghijklmnopqrstuvwxyz
testing
really
zero
three
fourteen
zero0
three0
fourteen0
Edit: Admittedly that top one probably provides us with very little information.