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Level 15 - XIRECEES
The answer to this puzzle is:
Words: CERISE, CREESE, EXCISE, SEXIER, EXECS, REXES, CIRES, SIREE, XERIC, RICES, CERES, RESEE, CRIS, RISE, ICES, SERE, REES, RECS, REIS, EXES, EXEC, CEES, CIRE, CERE, ERE, SEC, SIR, SIC, SER, RES, IRE, REC, SIX
Bonus words:
CERISE, CREESE, EXCISE, SEXIER, EXECS, REXES, CIRES, SIREE, XERIC, RICES, CERES, RESEE, CRIS, RISE, ICES, SERE, REES, RECS, REIS, EXES, EXEC, CEES, CIRE, CERE, ERE, SEC, SIR, SIC, SER, RES, IRE, REC, SIX