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Level 13 - ERBRRAI
The answer to this puzzle is:
Words: BARRE, RARER, BRIER, REBAR, AIRER, BARER, BRRR, BRAE, ABRI, BRIE, BIER, BIRR, REB, ARE, IRE, ERR, EAR, ARB
Bonus words:
BARRE, RARER, BRIER, REBAR, AIRER, BARER, BRRR, BRAE, ABRI, BRIE, BIER, BIRR, REB, ARE, IRE, ERR, EAR, ARB