Hey, I don’t think it’s intentional though.  Gregg and Major System have a similar structure because they utilise the very same English alphabet and language, which only has ONE structure.  Say I were Harry Lorayne and you were Gregg and we need to put some order into a jar of red and blue jelly beans.  I’d put all the red beans into one pile and all the blue ones into another, because this helps me structure the information for further memorization.  It’s easier to remember 57 blue and 69 red, then blue, blue, red, blue, red etc.  And you are Gregg, you do the very same thing for the same reason – it’s faster to write down R57/B69, as opposed to R B B R B R etc.  Hope you get my drift, haven’t had my coffee yet.PS Just yesterday I was browsing the internet archive for any new shorthand additions when I came across a mnemonics book with the original Major system.  Should have made a screen capture.  Don’t you think that 2=n 3=m 4=r 5=l leaves to little options to form words, especially in longer numbers?  Maybe 2=n/m and 3=r/l would have been a bit more logical,  Well, apparently these one letter numbers had more options like prefixes and suffixes, I can’t remember exactly, but 2 could stand for Con- and 3 for Com- and 6 for -shun.  So maybe, there is a definite shorthand link.  I’m pretty sure these guys took shorthand in school anyways)