The new boat ramp has a ladder-style frame having C-shaped elongated lateral side rails held in spaced apart parallel condition by C-shaped cross support beams. Each first storage system assigns a sequential number to write data received from the host and sends the write data with the sequential number to the second storage system. A first curvature slope is calculated for the selected rings, those points where the curvature slope departs from the pattern expected for a polyp or lesion are deleted from the surface. The costs associated with each driver are identified as fixed and, where appropriate, variable components. The voltage pulse has a rise time longer than a discharge formative time lag when a rectangular voltage pulse is applied, when a distance between the workpiece and the wire is an average value in machining, and rises to the same voltage as the rectangular voltage pulse. The apparatus further includes a gear assembly engaged with the first spur gear and the second spur gear and adapted to be coupled with the control surface.