An amphibious vehicle, in the form of an inflatable boat has a self propelled and steerable retractable undercarriage system, enabling the vehicle to enter and exit the water under its own power. Individual formed devices are spaced from at least one other of the devices by a distance no more than a width of one of the electrically insulative spacers. A class is generated for at least one element to implement methods from information provided on elements in the document and a mapping indicating at least one element in the document to map to a class. The pressing member includes a plurality for elongated slots formed therein and a plurality of pressing points each defined under a front end of each elongated slot.