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check over
check through
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check up on
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check digit
check dig·it (plural check digits)


noun 
Definition:
 
digit used for validation: in computing, a digit derived from and added to the other digits in a sequence, used to ensure that the sequence is correct
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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