## Make {x^2 – axy + by^2, x^2 – cxy + dy^2} squares

$x^2 \; - \; a \, x \, y \; + \; b \, y^2 \; = \; M^2$
$x^2 \; - \; c \, x \, y \; + \; d \, y^2 \; = \; N^2$

where   $a, \; b, \; c, \; d$   are any four consecutive prime numbers

For example,