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Free from obstruction, 5 letters
Free up a river's flow, maybe, 5 letters
Open, as floodgates, 5 letters
Stop blocking, as a river, 5 letters
Chronologically ambiguous, 7 letters
Like nonvintage wine, 7 letters
Like some ancient manuscripts, 7 letters
Not listing year of creation, 7 letters
Like the Mississippi, 9 letters
It's observed on Oct. 24, 5 letters