premise: On June 13th, 1986, Mary-Kate Olsen and Ashley Olsen were born.
hypothesis: Ashley Fuller Olsen ( born June 13 , 1986 ) is an American actress , fashion designer , producer , author , and businesswoman . Mary-Kate Olsen ( born June 13 , 1986 ) is an American actress , fashion designer , producer , author , businesswoman , and equestrian . Mary-Kate Olsen and Ashley Olsen ( born June 13 , 1986 ) , also known as the Olsen twins collectively , are American fashion designers and former child actresses .