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Level 10 - UINFSRG
The answer to this puzzle is:
Words: UNRIGS, FUSING, RUING, SUING, RUINS, GRINS, RUNGS, USING, GIRNS, FRUGS, UNRIG, FRIGS, GNUS, FURS, RIGS, GIRN, FIRS, URNS, FIRN, GINS, FUNS, SNUG, FRUG, RINS, FUGS, FRIG, SIGN, RUNG, SING, SUNG, FIGS, RUIN, FINS, RUGS, RING, SURF, RUNS, GUNS, GIN, RUN, GNU, GUN, SIR, FIG, SUN, FIR, FUR, INS, FIN, URN
Bonus words:
UNRIGS, FUSING, RUING, SUING, RUINS, GRINS, RUNGS, USING, GIRNS, FRUGS, UNRIG, FRIGS, GNUS, FURS, RIGS, GIRN, FIRS, URNS, FIRN, GINS, FUNS, SNUG, FRUG, RINS, FUGS, FRIG, SIGN, RUNG, SING, SUNG, FIGS, RUIN, FINS, RUGS, RING, SURF, RUNS, GUNS, GIN, RUN, GNU, GUN, SIR, FIG, SUN, FIR, FUR, INS, FIN, URN