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Level 4 - NTCDSEE
The answer to this puzzle is:
Words: SCENTED, TENSED, CENSED, NESTED, SENTE, DENTS, STEED, DEETS, CEDES, SCEND, CETES, CENSE, DENES, CEDE, ESNE, DENS, CETE, CEES, DEES, DEET, DENE, SECT, ENDS, CENT, NEST, TEEN, SENT, SEND, NEED, TENS, NETS, TEES, DENT, SEE, END, ETC, NET, TED, DEN, TEN, NEE, EDS, SET, SEN, SEC, TEE
Bonus words:
SCENTED, TENSED, CENSED, NESTED, SENTE, DENTS, STEED, DEETS, CEDES, SCEND, CETES, CENSE, DENES, CEDE, ESNE, DENS, CETE, CEES, DEES, DEET, DENE, SECT, ENDS, CENT, NEST, TEEN, SENT, SEND, NEED, TENS, NETS, TEES, DENT, SEE, END, ETC, NET, TED, DEN, TEN, NEE, EDS, SET, SEN, SEC, TEE