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Level 2 - ATSNLIL
The answer to this puzzle is:
Words: TALLIS, INSTAL, SLAIN, ANTIS, ALIST, SLANT, LITAS, TILLS, TALLS, TAILS, TAINS, NILLS, ANILS, LINTS, LILTS, TANS, LATS, TALI, SILT, ANIL, LINS, ILLS, NILS, SLAT, AILS, ANIS, TAIN, TILL, NITS, ALLS, ALIT, NAIL, ANTS, LAIN, LATI, ANTI, SAIL, ALTS, TAIL, SAIN, LAST, AINS, SILL, TINS, LILT, LIST, AITS, SNIT, ANI, SIN, SIT, TIL, SAT, ITS, TIN, TAN, ANT, LIT, ILL, LIN, NIT, AIL, LAT, NIL, ALT, INS, ALL
Bonus words:
TALLIS, INSTAL, SLAIN, ANTIS, ALIST, SLANT, LITAS, TILLS, TALLS, TAILS, TAINS, NILLS, ANILS, LINTS, LILTS, TANS, LATS, TALI, SILT, ANIL, LINS, ILLS, NILS, SLAT, AILS, ANIS, TAIN, TILL, NITS, ALLS, ALIT, NAIL, ANTS, LAIN, LATI, ANTI, SAIL, ALTS, TAIL, SAIN, LAST, AINS, SILL, TINS, LILT, LIST, AITS, SNIT, ANI, SIN, SIT, TIL, SAT, ITS, TIN, TAN, ANT, LIT, ILL, LIN, NIT, AIL, LAT, NIL, ALT, INS, ALL