All I know is that "has been" followed by verb+ing is a present perfect progressive tense that describes an action that began in the past, continues in the present, and may continue into the future. There is no verb + -ing in the sentence you posted. If you remove the relative clause, this is the sentence.
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AnonymousGreat forum! sorry for being an anonymous.Well, that is an easy fix! Please register - the site is very friendly, and we are here to help.