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You will need a valid passport.
This offer is valid for travel before the end of April.
If the underlying assumption isn't valid, then the prosecution's case simply falls apart.
These are valid reasons why we should ban tobacco advertising.
Some of the criticisms were perfectly valid.
the validity of the claim
This is the British English definition of valid. View American English definition of valid.
the period of 40 days before Easter, starting on Ash Wednesday, when some Christians stop eating...