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Level 20 - XNELIAP
The answer to this puzzle is:
Words: ALEXIN, PENIAL, PINEAL, XENIAL, ALPINE, NEPAL, PILEA, PENAL, PLENA, XENIA, LAPIN, ALINE, AXILE, ELAIN, ANILE, LIANE, PIAN, PLEX, ANIL, ELAN, PEAL, PANE, PAIL, NEAP, NIPA, LAIN, PLEA, APEX, AXEL, AXIL, AXLE, ILEX, PAIN, PALE, PLAN, LEAP, LIEN, PINA, LIPA, NAPE, LIPE, AIL, LAP, LIP, PEN, AXE, NAP, PEA, PIX, LIE, PIN, NIX, NIP, NIL, LIN, LEX, LEI, LEA, LAX, ANI, APE
Bonus words:
ALEXIN, PENIAL, PINEAL, XENIAL, ALPINE, NEPAL, PILEA, PENAL, PLENA, XENIA, LAPIN, ALINE, AXILE, ELAIN, ANILE, LIANE, PIAN, PLEX, ANIL, ELAN, PEAL, PANE, PAIL, NEAP, NIPA, LAIN, PLEA, APEX, AXEL, AXIL, AXLE, ILEX, PAIN, PALE, PLAN, LEAP, LIEN, PINA, LIPA, NAPE, LIPE, AIL, LAP, LIP, PEN, AXE, NAP, PEA, PIX, LIE, PIN, NIX, NIP, NIL, LIN, LEX, LEI, LEA, LAX, ANI, APE