doubling or just add

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RTKSMKLNMYBS DIPPEDTAPPED UGLLDITESTED HANDEDHINTED BJIXNIYJYXWA RFPTKVXNUUAD QBTBDDITADGJ JXVCNAPPEDBR HGFWORKLEIQU INESTEDJKFUW UTINTEDVSUWW UIXPATTEDFGB TENDEDZJKFRQ BSTEPPEDGRAY CPYIWZSMMCEP
1.
patted
2.
tended
3.
stepped
4.
tapped
5.
nested
6.
handed
7.
hinted
8.
dipped
9.
tinted
10.
napped
11.
tested