Hello everyone

Find the vertices and edges of the Polyhedron $\displaystyle X = \{ x \in \mathbb{R}^3 : Ax \le b \} ,$

$\displaystyle A = \begin{pmatrix} -1&-1&0\\-1&0&0\\1&-1&1\\-1&0&-1\end{pmatrix}$

$\displaystyle b = \begin{pmatrix} -1\\ -1 \\1 \\ 0 \end{pmatrix}$

I guess I found all the vertices, but how to determine the edges? I dont have any clue. Can someone help me, please?

Thanks in advance.

Rapha