Keller & Keuning's Protective Asset Allocation Ranking

The paper sites the rule here:

Has anybody recreated this ranking system? I don’t quite understand the formula. It sounds like I would create 13 rules, in a new custom ranking system, like this:

Close(0) / SMA(0) - 1
Close(0) / SMA(21) - 1
Close(0) / SMA(42) - 1
Close(0) / Close(63) - 1
…etc all the way back to Close(252)

But I must be getting the first rule wrong, it doesn’t make sense wouldn’t it simply result in 0 every time?

Thanks for any help.