premise: Mary-Kate Olsen and Ashley Olsen are designers.
hypothesis: Ashley Fuller Olsen ( born June 13 , 1986 ) is an American actress , fashion designer , producer , author , and businesswoman . She co-founded luxury fashion brands The Row , Elizabeth and James , and the more affordable lines Olsenboye and StyleMint with her fraternal twin sister Mary-Kate Olsen . Mary-Kate Olsen ( born June 13 , 1986 ) is an American actress , fashion designer , producer , author , businesswoman , and equestrian . She co-founded luxury fashion brands The Row , Elizabeth and James , and the more affordable lines Olsenboye and StyleMint alongside her fraternal twin sister Ashley Olsen . 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 .