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Level 20 - USECLON
The answer to this puzzle is:
Words: UNCLOSE, UNCLES, CLONUS, OUNCES, OSCULE, COLEUS, CONSUL, CLONES, ENSOUL, LUCES, LENOS, OUNCE, SCONE, OUSEL, NOELS, CLONE, SOCLE, LUNES, LOUSE, CLONS, CLUES, LOCUS, COLES, CONES, UNCOS, CONUS, SEOUL, LUCE, CLON, CELS, COLS, UNCO, CUES, ECUS, SLUE, ONUS, SONE, SLOE, ONES, NOUS, NOEL, LUNE, LUES, LONE, LENS, LENO, ENOL, CONS, COLE, EONS, ONE, CEL, LES, SOU, SOL, SEN, SEC, OLE, NOS, EON, COS, CON, COL, SON
Bonus words:
UNCLOSE, UNCLES, CLONUS, OUNCES, OSCULE, COLEUS, CONSUL, CLONES, ENSOUL, LUCES, LENOS, OUNCE, SCONE, OUSEL, NOELS, CLONE, SOCLE, LUNES, LOUSE, CLONS, CLUES, LOCUS, COLES, CONES, UNCOS, CONUS, SEOUL, LUCE, CLON, CELS, COLS, UNCO, CUES, ECUS, SLUE, ONUS, SONE, SLOE, ONES, NOUS, NOEL, LUNE, LUES, LONE, LENS, LENO, ENOL, CONS, COLE, EONS, ONE, CEL, LES, SOU, SOL, SEN, SEC, OLE, NOS, EON, COS, CON, COL, SON