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As sour as the grapes
Sour Grapes - book - was created in 1921.
The duration of Sour Grapes - film - is 1.52 hours.
Sour Grapes - film - was created on 1998-04-17.
Sour grapes aren't ripe and haven't produced the sugar that makes them sweet yet.
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Also, wine grapes tend to be more sour and table grapes tend to be sweeter. Wine grapes aren't necessarily intended to be eaten and table grapes are.