Your first command uses 13 distinct non-alphanumeric characters: &#x27;{=&quot;\;}$~&#x2F;.*&amp;<p>It looks more like black magic than code to someone like me who doesn&#x27;t know awk. It reminds me of these APL&#x2F;J&#x2F;K solutions I see on projecteuler.net. I imagine this is what happens when people completely ignore learning curve steepness and optimize for maximum productivity. Very impressive!