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Level 4 - SLNLTOIA
The answer to this puzzle is:
Words: TALIONS, LINTOLS, ALLOTS, TALLIS, ATOLLS, STANOL, LLANOS, TALONS, SANTOL, LINTOL, TALION, ALOINS, TOLANS, INSTAL, OSTIA, NAILS, STALL, TILLS, ALTOS, TAINS, ANTIS, SANTO, SLANT, LOINS, TOLLS, ALLOT, LITAS, TONAL, SLAIN, LLANO, TAILS, SOLAN, TOILS, LILOS, LILTS, TOLAS, LINTS, SALOL, NOTAL, IOTAS, STOAI, NOILS, ANILS, NILLS, LOTAS, ALOIN, LINOS, ALIST, OLLAS, TALLS, TOLAN, SLAT, LATI, LINO, NITS, NILS, TALI, SILT, ANIL, SNIT, TANS, LATS, LOTI, ALIT, LILT, OAST, SAIN, SOLI, AITS, ALTS, AINS, LILO, LINS, TAIN, AILS, ANIS, ALLS, ILLS, SAIL, TAIL, SLOT, SNOT, ALTO, LOST, IONS, LOIN, LIST, SOIL, SALT, ANTI, TOLL, TONS, TALL, TILL, LOAN, LOTS, LAOS, LAST, ANTS, OILS, SILO, NAIL, LINT, NOTA, LION, SOLA, IOTA, TOIL, TINS, SILL, ALSO, INTO, OATS, LAIN, SLIT, ALL, NOT, ITS, SAT, ANT, TON, LOT, TAN, TIN, ALT, NIT, LIN, LAT, AIL, OAT, SOT, SON, ANI, NIL, SOL, TIL, SIT, SIN, LIT, ILL, NOS, INS, ION, OIL
Bonus words:
TALIONS, LINTOLS, ALLOTS, TALLIS, ATOLLS, STANOL, LLANOS, TALONS, SANTOL, LINTOL, TALION, ALOINS, TOLANS, INSTAL, OSTIA, NAILS, STALL, TILLS, ALTOS, TAINS, ANTIS, SANTO, SLANT, LOINS, TOLLS, ALLOT, LITAS, TONAL, SLAIN, LLANO, TAILS, SOLAN, TOILS, LILOS, LILTS, TOLAS, LINTS, SALOL, NOTAL, IOTAS, STOAI, NOILS, ANILS, NILLS, LOTAS, ALOIN, LINOS, ALIST, OLLAS, TALLS, TOLAN, SLAT, LATI, LINO, NITS, NILS, TALI, SILT, ANIL, SNIT, TANS, LATS, LOTI, ALIT, LILT, OAST, SAIN, SOLI, AITS, ALTS, AINS, LILO, LINS, TAIN, AILS, ANIS, ALLS, ILLS, SAIL, TAIL, SLOT, SNOT, ALTO, LOST, IONS, LOIN, LIST, SOIL, SALT, ANTI, TOLL, TONS, TALL, TILL, LOAN, LOTS, LAOS, LAST, ANTS, OILS, SILO, NAIL, LINT, NOTA, LION, SOLA, IOTA, TOIL, TINS, SILL, ALSO, INTO, OATS, LAIN, SLIT, ALL, NOT, ITS, SAT, ANT, TON, LOT, TAN, TIN, ALT, NIT, LIN, LAT, AIL, OAT, SOT, SON, ANI, NIL, SOL, TIL, SIT, SIN, LIT, ILL, NOS, INS, ION, OIL