CUSIP NO. 204914402 SCHEDULE 13D
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Exhibit A
The undersigned, being duly authorized thereunto, hereby execute this agreement as an exhibit to
this Schedule 13D to evidence the agreement of the below-named parties, in accordance with the
rules promulgated pursuant to the Securities Exchange Act of 1934, to file this Schedule jointly on
behalf of each such party.
Signature Block
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YORKTOWN AVENUE CAPITAL, LLC |
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VALUE FUND ADVISORS, LLC |
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