A.1.5t B.t-(1~2) C.1.2t D.min{t-(1~2),1.2t}
A.1.5tmax B.t-(1~2) C.1.2tmin D.1.2tmax
A.1.5tmax B.1.5min C.1.5tmax-1 D.1.5max+13-17