Good point, but remember x is arbitary,secondly combos are budget related.
Some will start with all combos with different waging style just to get frequent hits of $100,200 for now.From my thread, I did addressed this issue, but for some reason, guys keep asking the same questions.
Lets start with the combos,'cos at this juncture,the base key is not the issue,but rather the x option.
X option:
1.Assumed having a base key that hits every1 to 5 draws, but missing a digit ,the rational will be to use the pool(0-9) as your x, this will give u 40 lines of combos 1234, 123x,124x,134x,234x( 40 lines of combinations not permutations).One may choose box bet and play 50cents , spending $100 for 5 draws(better to play in advance.your combos are reduced by the wager amount,the downside is you always recover your money but don't win big).
2.Reducing combos and beting box/str:The system is build in a sequencial way,so the base key behavior should be observed, I treat the keys as patterns not digits, hence 1234 is different from 4321.In my thread I did stressed the need(Seems folks are reading fast to a destination!) of testing and observing key combos, you'll find out for a hypoth.key like 1234, that 123x,124x is more prevalent than 134x ,234x, so if the observation is true in high percentage, then my combos is reduced to 123x and 124x(20 lines of combo, still uphill to win big)
3.Reducing combos further: I tested 20 different states with the keys and came out with corresponding x. so from note 2, your combo is is further reduced to 8 lines(123x,124x, x is mostly 4 digits from the chart, u can also deduce the x from your state by comparing keys to hits, u 'll find the digit u missed,note it down ).
4.From note 3, u can step from combination to permutation wiith a nice wheel or box matrix wheel( google)
final note ,for folks playing doubles, remember the digits of base key is SEQUENTIAL, meanining 1 has prioty over 2,cosi via.
so if u want to play a key base 1234 using note 2, your combos is 1231,1232 more than 1341 etc,etc.
I am responding your questions ,but also giving tips to what Folks might have missed reading my thread.