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Level 22 - LNREAI
The answer to this puzzle is:
Words: RENAIL, NAILER, ALINER, LARINE, RENAL, ELAIN, ANILE, ALINE, LIANE, ARIEL, AIRN, ANIL, NEAR, ELAN, RILE, LIER, LIRE, IRAN, LEAR, RIAL, RIEL, LAIN, RANI, LIRA, ARIL, LIEN, EARL, LARI, LAIR, ERA, ARE, IRE, LEA, ANI, LEI, LIN, NIL, RAN, AIL
Bonus words:
RENAIL, NAILER, ALINER, LARINE, RENAL, ELAIN, ANILE, ALINE, LIANE, ARIEL, AIRN, ANIL, NEAR, ELAN, RILE, LIER, LIRE, IRAN, LEAR, RIAL, RIEL, LAIN, RANI, LIRA, ARIL, LIEN, EARL, LARI, LAIR, ERA, ARE, IRE, LEA, ANI, LEI, LIN, NIL, RAN, AIL