premise: The Africa Cup of Nations is held in odd-numbered years due to conflict with the World Cup.
hypothesis: Africa Cup of Nations . It is sanctioned by the Confederation of African Football ( CAF ) , and was first held in 1957 . Since 1968 , it has been held every two years . As of 2013 , the tournament was switched to being held in odd-numbered years so as not to clash with the FIFA World Cup .