? alpha
 -0.361269102746989     
? x 1:21 1:4
           1           1           1           1
           1           1           1           1
           0           1           1           1
           1           1           1           1
           1           1           1           1
           1           0           1           1
           1           0           1           1
           1           1           1           1
           0           1           1           1
           0           1           0           0
           0           0           0           1
           1           0           1           0
           1           0           1           0
           0           1           0           0
           0           0           1           0
           0           0           0           0
           0           0           0           1
           0           1           0           0
           0           0           0           0
           0           0           0           0
           0           0           0           0