in advance

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See: vanward
References in classic literature ?
Something must be done at once or they would rush forward upon their fellows in a mad stampede that would result in trampling down hundreds beneath the flood and eventually clogging the passage beyond any hope of retreat for those in advance.
There is no provision for payment in advance when it is not mandatory for the contracting authority.
The INS could insist that all testing times and sites be publicly announced several weeks in advance.