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Level 13 - FSGEUIR
The answer to this puzzle is:
Words: GRIEFS, REGIUS, FURIES, FRIGES, URGES, SERIF, SIEUR, REIFS, GRUES, FRUGS, FRISE, FRIGS, FRIES, FIRES, GUISE, EGIS, REIS, GRUE, FUSE, GIES, FURS, FUGS, RUSE, FRUG, REGS, RIGS, REFS, FIRS, RUES, FIGS, FEUS, RUGS, ERGS, SIRE, RIFE, SERF, FRIG, FIG, FIE, RUE, FIR, REF, REG, RES, ERG, FER, SER, IRE
Bonus words:
GRIEFS, REGIUS, FURIES, FRIGES, URGES, SERIF, SIEUR, REIFS, GRUES, FRUGS, FRISE, FRIGS, FRIES, FIRES, GUISE, EGIS, REIS, GRUE, FUSE, GIES, FURS, FUGS, RUSE, FRUG, REGS, RIGS, REFS, FIRS, RUES, FIGS, FEUS, RUGS, ERGS, SIRE, RIFE, SERF, FRIG, FIG, FIE, RUE, FIR, REF, REG, RES, ERG, FER, SER, IRE