 Complete the following phrase:  The top 21 teams listed in the CAF Ranking shall automatically qualify for the group stage. The seven other teams playing in the group stage shall be determined following the conclusion of the qualifying rounds. The ranking is computed using the teams results in the 2013 Africa Cup of Nations finals weighted by 3 and qualifiers, the 2012 Africa Cup of Nations finals weighted by 2 and qualifiers weighted by 0.5, the 