Letter pairs arranged by frequency groups according to the Brown (Kucera & Francis, 1967) corpus of the English language.

Group 1:
al
an
ar
as
at
en
er
es
et
he
ha
hi
in
is
it
nd
of
on
or
ou
re
se
st
th
to

Group 2:
ac
ad
ai
ay
be
ca
ce
ch
co
de
ea
ed
ee
el
fe
fi
fo
fr
ge
gh
ho
ic
id
il
im
ir
la
ld
le
li
ll
lo
ly
ma
me
mi
mo
ne
nh
no
nt
ol
om
oo
os
ow
pe
qu
ra
ri
ro
rs
sh
si
so
ta
te
ti
ts
ul
un
ur
us
ut
ve
wa
we
wh
wi
wo

Group 3:
ab
af
ag
ak
am
ap
au
av
aw
ba
bi
bl
bo
br
bu
by
ci
ck
cl
cr
ct
cu
da
di
do
dr
ds
du
dy
ec
ef
eg
ei
em
eo
ev
ew
ex
ey
fa
ff
fl
ft
fu
gg
gi
gl
go
gr
gs
gu
hr
ht
hu
hy
ia
ie
if
ig
ik
io
ip
iv
jo
ju
ke
ki
ko
ks
lf
ls
lt
lu
mb
mp
ms
mu
my
na
nc
ni
nk
nl
nn
ns
nu
ny
oa
ob
oc
od
oe
oi
ok
op
ov
pa
pi
pl
po
pp
pr
ps
pt
pu
rc
rd
rg
rk
rl
rm
rn
rr
rt
ru
rv
ry
sa
sc
sk
sl
sm
sp
ss
su
sy
tl
tr
tt
tu
tw
ty
ua
ub
uc
ud
ue
ug
ui
um
up
va
vi
vo
wn
wr
ws
xt
ye
yo
ys

Database © 2004 Hrant H Papazian
Unrestricted personal usage permitted.
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