$A$
$B$
$Y$
$1$
$0$
$P\,\, 1\,\, 1\,\, 0\,\, 0$
$Q\,\, 1\,\, 0\,\, 1 \,\,0$
$R\,\, 1\,\, 0\,\, 0 \,\,0$