Chris provided a thoughtful and thorough answer to Nancy's questions. I'd just
add that for this particular dance, you'll want to have plenty of space along
the lines to do the cloverleaf turn single. Each dancer is making a loop, and if
the neighboring sets along the line are too close to each other it's hard for
dancers to make those loops large enough to use up the four beats allotted for
the figure.
David Millstone