[. . . ] [. . . ] 2-21-a 2-21-b 2-21-c 2-21-d 2-21-a 2-21-b 2-21-c 2-21-d 2-22-a 2-22-b 2-22-c 2-22-d 2-22-a 2-22-b 2-22-c 2-22-d [. . . ] [. . . ]