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Level 13 - ETNSNIE
The answer to this puzzle is:
Words: TENNIES, SENNIT, SENNET, TINES, NINES, STEIN, SEINE, SENTI, INSET, SENTE, NENES, NITES, NEIST, ESNE, NITE, SNIT, NITS, NENE, TINS, TINE, NETS, TIES, SENT, TEES, TENS, SINE, INNS, NET, SET, TIE, ITS, SEE, SIN, INN, TEE, NIT, NEE, SEN, INS
Bonus words:
TENNIES, SENNIT, SENNET, TINES, NINES, STEIN, SEINE, SENTI, INSET, SENTE, NENES, NITES, NEIST, ESNE, NITE, SNIT, NITS, NENE, TINS, TINE, NETS, TIES, SENT, TEES, TENS, SINE, INNS, NET, SET, TIE, ITS, SEE, SIN, INN, TEE, NIT, NEE, SEN, INS