be a strip set which contains n strips.
As shown in Fig 5(b), the strips in each layer (called l) are
arranged along a straight line parallel to either x or y axis in the
3D-CS. The surfaces of the envelope cuboid of each strip should
be parallel to xy plane, xz plane or yz plane. The strips in l should
also be arranged such that the volume of the envelope cuboid
(see Fig. 5(b)) is minimized. The envelope cuboid must be no
longer in length than mx (or my) of the corresponding residual