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The package ValidCASNumberQ.m implements the function ValidCASNumberQ which checks if its input is a valid CAS number. Its argument can be a string (e.g. "7440-35-9") or an integer (e.g. 7440359). For integer arguments, remove the dashes in the CAS number.
Please refer to the web page http://www.cas.org/EO/checkdig.html for information on the method used to check validity.
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