Chapter 2, Problem 44P

Create a 2 × 3 matrix A in which all the elements are 1. Then reassign A (several times) such that a will become:

$A=\left[\begin{array}{cccc}1& 1& 0& 0\\ 1& 1& 0& 0\\ 1& 1& 0& 0\\ 0& 0& 1& 1\\ 0& 0& 1& 1\\ 0& 0& 1& 1\end{array}\right]$