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Level 11 - APKEXCI
The answer to this puzzle is:
Words: PICKAX, PIKE, PICA, PIKA, APEX, PICE, KEPI, PEC, KIP, PIC, ACE, PIX
Bonus words:
PICKAX, PIKE, PICA, PIKA, APEX, PICE, KEPI, PEC, KIP, PIC, ACE, PIX