$y=0$ (stable), $y=1$ (unstable), $y=-1$ (unstable)

$y=0$ (unstable), $y=1$ (stable), $y=-1$ (stable)

$y=0$ (semi-stable), $y=1$ (stable), $y=-1$ (stable)

$y=0$ (semi-stable), $y=1$ (unstable), $y=-1$ (unstable)