premise: Billie has visited Hannibal, Muscatine, Dalton, Maryville, Corinth, Barrington, Greenville, Hillsboro, Xenia, Mobridge, Littleton, French Lick, Fort Smith, Walpi, Ansonia, Collinsville, Casper, Belle Glade and Ypsilanti
hypothesis: Billie has visited more than eighteen places