Sure.
I have X1, X2, X3,..., X9. Each one can take 2 values (i.e. X1=(X11,X22)). Therefore, in total i can create 2^9 vectors of length 9 in which the first element is X1, the second X2, etc.
That is, B(1,:)=(X11, X21, X31, ..., X91)
That makes more sense?
Thanks!