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Level 21 - ITPHRBIO
The answer to this puzzle is:
Words: PROBIT, TORII, BRITH, THORP, ORIBI, THRIP, TOPHI, ROTI, BRIO, TIPI, OBIT, PITH, TOPI, BORT, TORI, BIRO, TIRO, PHOT, BRIT, TRIO, TROP, RIOT, RIP, BOT, HOP, BIO, TOP, HOB, TIP, PRO, ROB, PHI, TOR, THO, POT, RIB, RHO, BOP, ORB, POI, BRO
Bonus words:
PROBIT, TORII, BRITH, THORP, ORIBI, THRIP, TOPHI, ROTI, BRIO, TIPI, OBIT, PITH, TOPI, BORT, TORI, BIRO, TIRO, PHOT, BRIT, TRIO, TROP, RIOT, RIP, BOT, HOP, BIO, TOP, HOB, TIP, PRO, ROB, PHI, TOR, THO, POT, RIB, RHO, BOP, ORB, POI, BRO