One set of two...need clarification :)

Could someone clarify what “at least one set of two on either side to secure it” means? This is for a hat on DPNs. I am familiar with one stitch marker, but a set of two on either side? I’m confused!!~from self taught beginner.

Instructions are for size S (M, L). Cast on 48 (54, 60) sts, dividing over four needles in multiples
of 2; place a marker for the start of the round with at
least one set of 2 on either side, to secure it.

Because the stitch pattern is multiples of 2sts, the pattern wants you to divide the cast on sts among 4 needles in multiples of 2. That way, you can do the k2tog with sts on the same needle.
It’s difficult to put a marker at the beginning of a dpn. It keeps sliding off! So the directions want you to place the marker [I]2sts[/I] (one set of 2sts) in from the end to hold the marker on the needle.
Maybe this pattern?
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CB4QFjAAahUKEwiPocLmzLPHAhUDoIAKHQp-D1U&url=http%3A%2F%2Fwww.marykeenanknits.com%2FSpinCycleHatbyMaryKeenanKnits.pdf&ei=26bTVc_HNYPAggSK_L2oBQ&usg=AFQjCNEHLtECAVZ6AtRBAgMMZWPmNdtntg

yes, that’s exactly the pattern! Must be well known! Thanks for your help!