Given are a $56$ matrix $A,$ a $36$ matrix $B,$ and a $9-$element vector $v.$

Create the three arrays in the Command Window, and then, by writing one command, replace the last four columns of the first and third rows of A with the first four columns of the first two rows of $B,$ the last four columns of the fourth row of A with the elements $5$ through $8$ of $v,$ and the last four columns of the fifth row of A with columns $3$ through $5$ of the third row of $B.$