Gods of Hentai Arena visibility

Arena 9 can see:  1,2,3, 5,6,7,8
Arena 10 can see: 1,2,3, 6,7,8,9
Arena 11 can see: 1,2,3, 5,6,7,8
Arena 12 can see: 1,2,3, 6,7,8,9
Arena 13 can see: 1,2,3, 6,7,9,10
Arena 14 can see: 1,2,3, 7,8,9,11
Arena 15 can see: 1,2,3, 7,9,10,12
Arena 16 can see: 1,2,3, 8,9,11,12
Arena 21 can see: 1,2,3, 9,11,13,15