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Dwytt Lewis is one of the 400 Morehouse College graduates whose entire student loan debt is being wiped by billionaire philanthropist Robert F Smith.Mr Smith, 56, is the founder of the private equity firm Vista Equity Partners and one of the nation’s most prominent African-American philanthropists.His net worth is estimated to be around $5bn – making him the wealthiest black American, ahead of Oprah Winfrey.