一応こっちにも・・・宜しければご参考までに。アリーナの現状
   1 2 3 4 5  6 7 8 9 10 11 12 13 14  15 16 17   
A      ■■■   ■■    ■     ■ ■      ■ ■
B  ■■■■■■■　　 ■ ■ ■ ■      ■ ■
C 　 ■    ■ ■■ ■       ■ ■ ■   ■■ ■ 
D        ■   ■      ■■■■ ■
E                     ■            ■■
F      ■■■ ■■              ■          ■
G ■■■          ■     ■ ■    ■ ■ ■   ■ 
H          ■ 
J        ■         ■■  ■
K               ■■    ■        ■