d1ufba_    d1ufbb_    d1ufbc_    d1ufbd_ 
d1ufba_           0.0        0.0       20.0        0.0 
d1ufbb_           0.0        0.0       28.0        0.0 
d1ufbc_          20.0       28.0        0.0       30.0 
d1ufbd_           0.0        0.0       30.0        0.0