Who was the first African-American president?
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African Americans speak American English.
African Americans are one of the native languages of American English .
Who was the first African-American president?</s>African Americans speak [unused1]American English                [unused2] .
Who was the first African-American president?</s>African Americans speak American English.
Who was the first African-American president?</s>African Americans are one of the native languages of [unused1]American English                [unused2] .
Who was the first African-American president?</s>African Americans are one of the native languages of American English .
Who was the first African-American president?</s>[unused1]American English[unused2],0,[unused1]American English[unused2],[unused1]American English[unused2],0,African Americans,African Americans,native language,[unused1]American English[unused2],African Americans,0,African Americans
Who was the first African-American president?</s>American English,0,American English,American English,0,African Americans,African Americans,native language,American English,African Americans,0,African Americans