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Level 4 - PSONTRGI
The answer to this puzzle is:
Words: PORTING, TRIGONS, PROSING, STOPING, TROPINS, SPORING, GIPONS, SIGNOR, GROINS, TRIGON, POSTIN, PITONS, INGOTS, PINTOS, PRIONS, SPINOR, PRONGS, ROPING, SPIGOT, PORING, GRIOTS, ROSING, SPINTO, GIRONS, ORPINS, RIPOST, TIGONS, TRIGOS, PINGOS, STINGO, TOPING, SORING, PINOTS, GRISON, PROSIT, TROPIN, NITROS, TRIPOS, POSING, OPTING, INTROS, PRION, SPRIG, PROST, STROP, GRIOT, TOPIS, INGOT, TINGS, INTRO, TRIOS, SPRIT, ROSIN, PIONS, SNORT, STIRP, TORSI, TRIGS, GRITS, PRONG, PINGS, POSIT, TROIS, PITON, SPORT, PINTS, PINGO, OPSIN, GIRTS, PIROG, TIGON, GIROS, PRINT, TIROS, GROIN, ROTIS, TONGS, STRIP, SPIRT, OPING, NORIS, PROGS, PONGS, ORNIS, TRIGO, GIRON, NOIRS, GRINS, GRIST, POINT, GROTS, GIRNS, TRIPS, GORPS, GIPON, GRIPT, PINTO, STING, PIRNS, GRIPS, PRIGS, IRONS, PORNS, PINOT, ORPIN, RIOTS, TONS, SNIT, TOGS, GIRT, TORN, POTS, PIGS, TROP, GRIT, PING, TING, STIR, GIRN, SIGN, GORP, GRIN, TINS, RING, OPTS, SONG, TORI, PROS, STOP, PINS, POST, TIPS, IRON, GIPS, SPOT, RIGS, GROT, RINS, PORT, GRIP, SORT, PRIG, TRIG, TRIP, PORN, POIS, TORS, PINT, TOPS, PROG, GIST, PITS, PONG, GITS, NIPS, INRO, NOIR, SNOT, GIRO, INTO, SNIP, NITS, ROTS, SPIT, RIOT, NORI, RIPS, TONG, PISO, SING, TRIO, TOPI, IONS, PION, GINS, TIRO, ROTI, SPIN, TOP, ITS, POT, GOT, TIN, GIN, SIT, NOT, NOG, RIP, OPT, ION, PIT, GIT, SIP, ROT, INS, NOS, RIG, OPS, NIP, NIT, PIG, TOR, SOP, POI, PSI, PIN, SOT, SIN, SIR, TON, PRO, NOR, TIP, SON
Bonus words:
PORTING, TRIGONS, PROSING, STOPING, TROPINS, SPORING, GIPONS, SIGNOR, GROINS, TRIGON, POSTIN, PITONS, INGOTS, PINTOS, PRIONS, SPINOR, PRONGS, ROPING, SPIGOT, PORING, GRIOTS, ROSING, SPINTO, GIRONS, ORPINS, RIPOST, TIGONS, TRIGOS, PINGOS, STINGO, TOPING, SORING, PINOTS, GRISON, PROSIT, TROPIN, NITROS, TRIPOS, POSING, OPTING, INTROS, PRION, SPRIG, PROST, STROP, GRIOT, TOPIS, INGOT, TINGS, INTRO, TRIOS, SPRIT, ROSIN, PIONS, SNORT, STIRP, TORSI, TRIGS, GRITS, PRONG, PINGS, POSIT, TROIS, PITON, SPORT, PINTS, PINGO, OPSIN, GIRTS, PIROG, TIGON, GIROS, PRINT, TIROS, GROIN, ROTIS, TONGS, STRIP, SPIRT, OPING, NORIS, PROGS, PONGS, ORNIS, TRIGO, GIRON, NOIRS, GRINS, GRIST, POINT, GROTS, GIRNS, TRIPS, GORPS, GIPON, GRIPT, PINTO, STING, PIRNS, GRIPS, PRIGS, IRONS, PORNS, PINOT, ORPIN, RIOTS, TONS, SNIT, TOGS, GIRT, TORN, POTS, PIGS, TROP, GRIT, PING, TING, STIR, GIRN, SIGN, GORP, GRIN, TINS, RING, OPTS, SONG, TORI, PROS, STOP, PINS, POST, TIPS, IRON, GIPS, SPOT, RIGS, GROT, RINS, PORT, GRIP, SORT, PRIG, TRIG, TRIP, PORN, POIS, TORS, PINT, TOPS, PROG, GIST, PITS, PONG, GITS, NIPS, INRO, NOIR, SNOT, GIRO, INTO, SNIP, NITS, ROTS, SPIT, RIOT, NORI, RIPS, TONG, PISO, SING, TRIO, TOPI, IONS, PION, GINS, TIRO, ROTI, SPIN, TOP, ITS, POT, GOT, TIN, GIN, SIT, NOT, NOG, RIP, OPT, ION, PIT, GIT, SIP, ROT, INS, NOS, RIG, OPS, NIP, NIT, PIG, TOR, SOP, POI, PSI, PIN, SOT, SIN, SIR, TON, PRO, NOR, TIP, SON