Since it's only 3 stitches, you could use the backward loop cast on, but personally I don't like that cast on method much (always gets so loose and floppy w/extra yarn). I'd use a knitted or cable cast on.
You'd actually do them at the end of the row,then they'd be the first stitches you'd knit on the next row.
Mirl56 at Ravelry, too.
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