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Level 20 - CNAGIUS
The answer to this puzzle is:
Words: SAUCING, CASING, ACINUS, SUING, SIGNA, CUING, INCUS, ACING, CAINS, GUANS, UNCIA, UNAIS, SAIN, NAGS, ANIS, CIGS, GUNS, ANUS, GUAN, ASCI, GINS, GAUN, CANS, AINS, SANG, SUNG, AGIN, GNUS, SNUG, SCAN, CAIN, CIG, SUN, SIN, GNU, GIN, SAC, SIC, ANI, NAG, SAG, INS, CAN
Bonus words:
SAUCING, CASING, ACINUS, SUING, SIGNA, CUING, INCUS, ACING, CAINS, GUANS, UNCIA, UNAIS, SAIN, NAGS, ANIS, CIGS, GUNS, ANUS, GUAN, ASCI, GINS, GAUN, CANS, AINS, SANG, SUNG, AGIN, GNUS, SNUG, SCAN, CAIN, CIG, SUN, SIN, GNU, GIN, SAC, SIC, ANI, NAG, SAG, INS, CAN