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Under the Sea Codeword

Every letter in this under the sea grid has been swapped for a number. 3 letters are given to start you off — work out the rest and fill the grid.

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210
1362016A8205E5E3
816A
141021181942016A12
91
181116A202016A131216A
19218
861321614110
5E7W
16A16A195E156195E
193
418
5E10
175E8812318109
321
1816A
105E16A9620105E
93
18
10
9

Letters so far

 1 2 3 4E5 6W7 8 9 10 11 12 13 14 15A16 17 18 19 20 21

Answers

DS
CORALREEF
LA
PSTINGRAY
HU
IBARRACUDA
NTL
LOCTOPUS
EW
AANEMONE
NF
GI
ES
JELLYFISH
FT
IA
SEAHORSE
HF
I
S
H
U1D2F3G4E5O6W7L8H9S10B11Y12C13P14M15A16J17I18N19R20T21

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