Boris
As you are using Saliu's programs, that makes this hard to understand to those of us who are not familiar with them, I think that he "Cloaks" the way in which some of his programs work, like "his" filters, but I am not sure of this as I have not yet used them.
Anyway, from what very little I have read here at LP about them, I think that some of his programs might use skips of "Filters" patterns, "Filters" being pretty much anything that can be used for reduction of pick 3 numbers (Combos).
To reduce the "Combos" to an amount that can be played for a profit, more than 1 "Filter" might need to be used, so filters are used together in whatever particular combination(s) they seem to work best at a particular time for a particular draw or even for some particular future draws to come next or soon.
That is not the "Full" story, while even the same filters might be used for more than one future draws to be predicted, not the very same filter pattern have to be used or should be used, as filters have several patterns to each of them, of course some filters have more patterns than others.
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General talk about skips can be confusing as skips apply to the lottery games in so many ways.
For example: There are skips of each of the patterns of each of the "Filters" and also there are skips of digits, pairs and whole 3 digits pick 3 numbers.
There are also skips of Winnings (Winning counts or times) in accord to particular or to any prediction method(s), technique(s) and or prediction program(s) used.
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I do agree in using the first half of the median skips, I have said the same thing to one or more persons before, when talking about the best use of the skips of filters patterns, maybe that was said in private to one person, unless I also posted about it somewhere here at LP.
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I guess that you are testing a program and technique here so people will see how well or bad it does maybe to see if in the future sometime they might be interested in it, (?).
From what I have read here, it appears as if you might know what you are doing, so I am also interested in this.
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Good Luck!
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Fernando.