but E here is in a two letter word and there no such words
you got the pair 6u twice and th is the most most likely pair
(Yes I have read code books and am very good at newspaper codes without cheating. For now see the wiki article on
Cryptanalysis
6u9e 6u54wr 9e w34e0k4!
Th-- Th---- -- -------!
now that T is out and looking at the pair 9e at is common but T is solved? so as but thas is not a word so trying is
6u9e 6u54wr 9e w34e0k4!
This Th---- is ---s---!
back to the Frequency Count
E=S 6=T U=H 9=I 4 W 5 R 3 O K
got three 4 so it might be E
6u9e 6u54wr 9e w34e0k4!
This Th-e-- is --es--e!
E=S 6=T U=H 9=I 4=E W 5 R 3 O K
got two W and missing A so it might be A
6u9e 6u54wr 9e w34e0k4!
This Th-ea- is a-es--e!
the next letter N does not seem to fit but O might
thoe ,eao, aoe oe are all noes so eso
and o might be 0
E=S 6=T U=H 9=I 4=E W=A 5 R 3 0=O K
6u9e 6u54wr 9e w34e0k4!
This Th-ea- is a-eso-e!
looking at so-e and
Letter Frequencies
missing R so make 5 R maybe
E=S 6=T U=H 9=I 4=E W=A 5=R R 3 0=O K
6u9e 6u54wr 9e w34e0k4!
This Threa- is a-eso-e!
and it looks like r is D so
E=S 6=T U=H 9=I 4=E W=A 5=R R=D 3 0=O K
6u9e 6u54wr 9e w34e0k4!
This Thread is a-eso-e!
l,c,f do not seem to fit but m does as K
E=S 6=T U=H 9=I 4=E W=A 5=R R=D 3 0=O K=M
6u9e 6u54wr 9e w34e0k4!
This Thread is a-esome!
and that makes 3 W and the final message this
E=S 6=T U=H 9=I 4=E W=A 5=R R=D 3=W 0=O K=M
6u9e 6u54wr 9e w34e0k4!
This Thread is awesome!
Final Freq. Count looks like this
ESTAIHORDMW
as to your code
A=W, bc, D=R, E=4, fg, H=U, I=9, jkl, M=K, n, O=0, pq, R=D, S=E, T=6, uv, W=3, xyz
W??R4??U9???K?0??DE6??3???