Two or more folds parallel to each other with adjacent folds in opposite directions

In saddle stitching, the thickness of the bound should not exceed

The operation of putting lines on blank or preprinted sheets

'Squareness' of trimmed paper is obtained by utilizing the ------------- component of the cutting machine.

Breaking of the fibers in paper or board to facilitate folding or bending 

In binding, the stitch at the top and bottom of the spine which connects each signature to the following one.