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Level 12 - RFHUNSI
The answer to this puzzle is:
Words: INRUSH, RUINS, SHUN, FUNS, FURS, SHRI, URNS, FIRS, HUNS, RUNS, HISN, FIRN, HINS, RINS, FINS, SINH, URN, SIR, RUN, FUR, INS, FIR, FIN, HIS
Bonus words:
INRUSH, RUINS, SHUN, FUNS, FURS, SHRI, URNS, FIRS, HUNS, RUNS, HISN, FIRN, HINS, RINS, FINS, SINH, URN, SIR, RUN, FUR, INS, FIR, FIN, HIS