You grab a loaf of bread to make a sandwich. Stick your hand into the package of sliced bread, for those who purchased packaged bread, and pull out 2 slices. For those who buy bread willy nilly, also grab 2 slices. No, we are not making a triple decker nor a quad decker but the same question can apply.
Do you slide the slices apart, construct the sandwich then close it like a book?
Or, do you open the slices like a book, contruct, then close the book?
Is there even a third option?
