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Level 17 - HIAPLYP
The answer to this puzzle is:
Words: HIPLY, PHYLA, PALPI, HAPLY, HIPPY, PIPAL, PHIAL, LIPPY, PIPY, PALP, HYLA, HILA, LIPA, PAIL, HAIL, PHI, PAH, YIP, PIP, PLY, AIL, YAP, PAP, APP
Bonus words:
HIPLY, PHYLA, PALPI, HAPLY, HIPPY, PIPAL, PHIAL, LIPPY, PIPY, PALP, HYLA, HILA, LIPA, PAIL, HAIL, PHI, PAH, YIP, PIP, PLY, AIL, YAP, PAP, APP