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Level 23 - EIRREDUQ
The answer to this puzzle is:
Words: QUERIER, QUERIED, UREIDE, DURRIE, QUIRED, DIRER, EQUID, DRIER, ERRED, RUDER, QUIRE, EIDER, DURR, RUED, DREE, REED, EIDE, DERE, REDE, DURE, RUE, ERE, ERR, IRE
Bonus words:
QUERIER, QUERIED, UREIDE, DURRIE, QUIRED, DIRER, EQUID, DRIER, ERRED, RUDER, QUIRE, EIDER, DURR, RUED, DREE, REED, EIDE, DERE, REDE, DURE, RUE, ERE, ERR, IRE