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Level 18 - PBOIITRH
The answer to this puzzle is:
Words: PROBIT, TOPHI, THRIP, ORIBI, BRITH, TORII, THORP, PITH, OBIT, TIPI, ROTI, BIRO, PHOT, TIRO, TOPI, TORI, BORT, BRIO, BRIT, TROP, TRIO, BOP, BOT, HOB, TIP, PRO, BIT, BIO, HOT, RIP, ROB, TOP, OPT, BRO, PHI, ORB, POI, RHO, TOR, THO, HIP
Bonus words:
PROBIT, TOPHI, THRIP, ORIBI, BRITH, TORII, THORP, PITH, OBIT, TIPI, ROTI, BIRO, PHOT, TIRO, TOPI, TORI, BORT, BRIO, BRIT, TROP, TRIO, BOP, BOT, HOB, TIP, PRO, BIT, BIO, HOT, RIP, ROB, TOP, OPT, BRO, PHI, ORB, POI, RHO, TOR, THO, HIP