21Questi:d=4,o=6,b=112:8f,8g,2a,8c,8d,8p,8c,8d,8p,8f,8p,8f,8g,8c,8d,8p,8c,8d,8p,8f,8p,8f,8g,2a,8c,8d,8p,8c,8d,8p,8f,8p,8f,8g,2a,p,8g,p,8g,p,8g,8p,8f,8g,2a