johnson789
Not sure if @nano system is a secret so to speak. At least not that I am aware! I've just been tracking/following his postings under the Predictions heading in the forum and I think out of generosity he chooses to post them for all to see or play online if they so chooses.
He's based out of Illinois and its up to you whether you choose to play the combo str88 or box. Personally I tend to go with box plays especially for 6 way single combo which leads me into your question.....
"What does it means when some of the numbers are like 651-156 in combinations with other numbers"?
Ok...in a nutshell all that means is there are 6 ways you can play a single digit combo for a box hit. However, if you choose to play str88 there is only 1 way to play that combo.
Example: 651 can be played as 156 165 516 561 615 651 meaning whichever one of those 6 combos fall and you wager as a "box" play you are in the money. However, if you are only a str88 bettor. only 1 out of the six would have you in the winner's circle. Now the trick is to decide which one you think will be the str88 hit or if you have a large bankroll you can play all 6 str88 and no matter which way they fall you will be covered. Of course your decision on how to wager
after selecting your combos would be based solely on your w/o strategies etc. etc.
Hope I was able to answer your inquiry clearly and should you need to do a deep dive you can check out www.pick3mastery.com. One of many sources online where you can find further tips.
Peace!