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If you were given a termination letter stating that you were terminated without cause, as you stated, then this is what you need to tell the prospective employers as you have the letter stating that your work was terminated for no cause and you were given your severance as promised. Thus, the letter states no misconduct and that is what you are entitled to tell the prospective employers. If your previous employer says differently, which they unlikely will do because then they open themselves to a suit for defamation based on their own letter stating your termination was for no cause, then as I said, you would have grounds to sue the previous employer for defamation because you have their own words saying your contract was ended for no cause.
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