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Level 51 - ARLINEI
The answer to this puzzle is:
Words: NAILER, LINIER, LARINE, INLIER, ALINER, RENAIL, ALINE, LIANE, ELAIN, ARIEL, RENAL, ANILE, NAIL, LAIN, LIER, RAIL, LEAR, ARIL, INIA, ILIA, ELAN, EARL, LIAR, ANIL, LAIR, NEAR, AIRN, RILE, RIEL, RIAL, LARI, RANI, IRAN, REAL, LIRA, LIEN, LIRE, ALE, AIL, ANI, RAN, NIL, LIN, LEI, LEA, IRE, ARE, ERA
Bonus words:
NAILER, LINIER, LARINE, INLIER, ALINER, RENAIL, ALINE, LIANE, ELAIN, ARIEL, RENAL, ANILE, NAIL, LAIN, LIER, RAIL, LEAR, ARIL, INIA, ILIA, ELAN, EARL, LIAR, ANIL, LAIR, NEAR, AIRN, RILE, RIEL, RIAL, LARI, RANI, IRAN, REAL, LIRA, LIEN, LIRE, ALE, AIL, ANI, RAN, NIL, LIN, LEI, LEA, IRE, ARE, ERA