21Questi:d=4,o=6,b=90:16b,16c_,d_,8p,16f_,16g_,16p,16f_,8g_,8b,16b,16c_,d_,8p,16f_,16g_,16p,16f_,8g_,8b,16b,16c_,d_,8p,16f_,16g_,16p,16f_,8g_,8b,16b,16c_,d_,16p,8b.,8c_.,16c_,16p