B       1       0       0       0       0       0       0
T       0       1       0       0       0       0       0
S       0       0       1       0       0       0       0
X       0       0       0       1       0       0       0
P       0       0       0       0       1       0       0
V       0       0       0       0       0       1       0
E       0       0       0       0       0       0       1