Like Jan in CA said, it's normally relevant to size. There's usually legend that explains how many stitches you need for x number of inches. If it's from a book, look throughout the book to see if there's a page that explains how they write out their sizes (including measurements).
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I agree with Jan and Box_of_cereal about the sizes. But if it's the "incl. 1 edge st each side" that has you confused, then I think that probably means that 2 of the cast on stitches -- one on each edge -- will be worked differently than the others to form edge stitches. But, like Jan suggested, it would be easier to tell if you could provide a link to the pattern.
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you are all going to laugh but i just realized that it's a english pattern...so it says that the sizing and everything is different...a little too difficult for me right now no matter how much i want to make it...if anyone is interested to see...
Hiya baby, all those numbers are how many to cast of for each particular size from small to xxx. And the "incl 1 edge st at each side" means that those two are in the cast on amount.
So basically what you would do is print out the pattern and then hi-lite your size and go from there.