https://www.forbes.com/sites/janetnovack/2017/02/22/beyond-buffett-how-to-build-wealth-copying-9-other-value-stock-pickers/#22905057eaf9
http://www.chaiwithpabrai.com/blog/beyond-buffett-how-to-build-wealth-copying-9-other-value-stock-pickers
"Positive 12 month income."
Tweak made later by Mohnish: "Our algorithms now allow companies from all industries to be a part of the Cloning bucket;"