A.SBA=4i B.SAB=3i C.SAB=i D.CBA=0.5 E.CAB=0
A.SBA=i B.SAB=3i C.SAB=i D.SBA=3i E.CAB=-1
A.SAB=4i B.SAB=3i C.SAB=i D.3i<SAB E.SAB<4i