Question: is there a way to reset variables Maple10 document mode

In a document where variable names are being reused is there a way to reset the variable names. For example in document mode, matrices A, B, and C are defined. Symbolic calculation results are as expected. Later A, B, C are redefined, but intended to be smaller matrices. Results are not as expected. But if I use new variables, e.g. A1, B1, and C1 results are expected. Is there away to reset A, B, C or reset all variables in the document? thanks for your suggestions, best regards, James Cunningham
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