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Level 23 - PXNHOIE
The answer to this puzzle is:
Words: PHENIX, OPINE, PEON, PION, PHON, OXEN, EXON, PONE, OPEN, EXPO, PIX, PHI, ION, HOE, HIE, PEN, POX, NIP, HEP, PIN, HON, EON, POI, NIX
Bonus words:
PHENIX, OPINE, PEON, PION, PHON, OXEN, EXON, PONE, OPEN, EXPO, PIX, PHI, ION, HOE, HIE, PEN, POX, NIP, HEP, PIN, HON, EON, POI, NIX