问一道Python题，检测一个list有无重复变量

刚接触Python,对于这题很困惑，希望大神可以解答一下。

Verify that no name is repeated in `members` by writing some code that prints `"Seems OK"` if no name is repeated, or prints out a name if it is repeated.

members = ["Arnetta","Thomasena","Arnetta","Tammera","Rosamaria","Rosamaria","Lorene","Ileana","Ileana","Angela","Carletta","Mathew","Kum","Preston","Charlene","Wilson","Kathryne","Ariel","Shawn","Stacie","Coralie","Kenna","Robert","Bethel","Marc","Ferdinand","Rico","Anne","Ginette","Tamiko","Dominque","Dian","Loraine","Sharen","Onie","Temeka","Ceola","Cherly","Samual","Leeanne","Rosamond","Arianna","Calandra","Violette","Jenelle","Luisa","Desiree","Krista","Brittani","Angella","Estela","Gudrun","Maryrose"];