Height is always the longest dimension. Width is always the shortest dimension.
| wtw | Width of the piece is parallel to the width of the parent sheet. |
| wth | Width of the piece is parallel to the height of the parent sheet. |
| twtw | Width of the piece is parallel to the width of the parent sheet. One additional row has pieces turned 90 degrees. |
| twth | Width of the piece is parallel to the height of the parent sheet. One additional column has pieces turned 90 degrees. |