That table has got to be the most ridiculous aspect of the rule book, in my opinion. I would love to have been a fly on the wall during that rules meeting where the table was proposed/approved as an necessary addition to the rule book.
"So if you have two blockers, and one is high and one is low, that's a foul?" "Yes!"
"What if they're both high?" "Then you don't have a low block, so it's legal"
"What if they're both low?" "Then you don't have a high block, so it's legal"
"This is confusing. Can you make a chart or something?"
There are many other rules with more nuance or judgement in application, that *this* is the rule that gets a table with all possible options? I feel we need more charts for other rules to clarify potential confusion then. Possession of a live ball in an opponent's end zone is a touchdown. What if you're in the end zone, but don't have possession? Is that a touchdown? What if you have possession, but aren't in the end zone? What then? We need a table to clarify this as well.