Suppose The Harry Potter series is a bestselling fantasy book series written by British author J.K. Rowling. The series follows the young wizard Harry Potter and his friends as they attend Hogwarts School of Witchcraft and Wizardry and battle the dark wizard Voldemort. The series consists of seven books, starting with "Harry Potter and the Philosopher's Stone" and ending with "Harry Potter and the Deathly Hallows."
Can we infer that "J.K. Rowling has only written one book."? Yes, no, or maybe?