Most common double letters in English words

Which double letters occur most frequently in English words?
As noted at http://mdickens.me/typing/letter_frequency.html
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Jerry928
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Last updated: June 8, 2014
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First submittedJune 6, 2014
Times taken198
Average score65.0%
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Double letter
LL
EE
SS
OO
TT
FF
RR
PP
MM
NN
CC
DD
GG
BB
II
WW
AA
ZZ
XX
KK, QQ, HH, YY, UU, VV, JJ
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4 Comments
+1
Level 94
Jun 6, 2014
Why is HH so high?
+1
Level 66
Jun 6, 2014
words like withhold, bathhouse, etc
+1
Level 80
Jun 6, 2014
Actually on the page where the dates was taken it says that:

Ignoring blanks somewhat reduces the usefulness of this data. The count for a pair, say yy , includes cases where one word ends with a y and the next word begins with a y .

+1
Level 76
Jun 8, 2014
I found a (hopefully more accurate) set that I've now just posted.