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Level 12 - DERIQRUE
The answer to this puzzle is:
Words: QUERIER, QUERIED, QUIRED, DURRIE, UREIDE, DIRER, QUIRE, EIDER, EQUID, ERRED, RUDER, DRIER, DREE, DURR, RUED, REED, REDE, EIDE, DEER, DERE, DURE, DUE, DIE, IRE, ERE, ERR, RUE
Bonus words:
QUERIER, QUERIED, QUIRED, DURRIE, UREIDE, DIRER, QUIRE, EIDER, EQUID, ERRED, RUDER, DRIER, DREE, DURR, RUED, REED, REDE, EIDE, DEER, DERE, DURE, DUE, DIE, IRE, ERE, ERR, RUE