SL -- Single Left

Starting with feet closed (or wherever the feet ended up after the last step), step to the left with the left foot, and then join feet, stepping to the left with the right foot.

SR -- Single Right

Step to the right with the right foot, then join feet, stepping to the right with the left foot.

DL -- Double Left

Step to the left with the left foot, bring the right foot over near the left foot (either to the right of it and adjacent to it, or to the right and slightly behind it, or behind it while turning slightly at the waist). Then step to the left again with the left foot, and join feet, stepping to the left with the right foot.

DR -- Double Right

Step to the right with the right foot, bring the left foot over near the right foot (either to the left of it and adjacent to it, or to the left and slightly behind it, or behind it while turning slightly at the waist). Then step to the right again with the right foot, and join feet, stepping to the right with the left foot.