Systems and methods for processing checks are described. The undulating surface topographies can first be exposed to one or more of titanium oxide, neodymium oxide, yttrium oxide, zirconium oxide and vanadium oxide to treat the surfaces, and can be subsequently exposed to a material that forms a layer conformally along the treated surfaces. The rear wheel of the motorcycle is driven by a motor to which power is supplied from a battery. A retaining protruding piece extending from a side portion opposite to a protruding portion and engaging with corresponding side portion of the shaft portion is formed on each both side leg portions. The invention also provides useful arylboron intermediates.