premise: The 2013 Africa Cup of Nations was the first held in an odd-numbered year, leading to a 3-year gap between the 2010 and 2013 tournaments.
hypothesis: The 2013 Africa Cup of Nations , also known as the Orange Africa Cup of Nations South Africa 2013 for sponsorship reasons , held from 19 January to 10 February 2013 , was the 29th Africa Cup of Nations , the football championship of Africa organized by the Confederation of African Football ( CAF ) . Starting from this edition , the tournament was switched to being held in odd-numbered years instead of even-numbered years so that it does not clash with the FIFA World Cup .