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Level 19 - SHIIGNW
The answer to this puzzle is:
Words: WISING, WINISH, NIGHS, WHINS, WHIGS, SINH, HISN, GHIS, IWIS, HINS, WHIN, SWIG, NISI, GINS, WHIG, NIGH, WIGS, SHIN, WINS, GIN, INS, HIS
Bonus words:
WISING, WINISH, NIGHS, WHINS, WHIGS, SINH, HISN, GHIS, IWIS, HINS, WHIN, SWIG, NISI, GINS, WHIG, NIGH, WIGS, SHIN, WINS, GIN, INS, HIS