| http://www.w3.org/ns/prov#value | - erating a direct current waveform signal having a predetermined level as a zero order waveform signal, a sawtooth waveform signal as a first order waveform signal, a parabolic waveform signal as a second order waveform signal, and an n-th order waveform signal, wherein n is an integer equal to or greater than 3 and wherein said sawtooth waveform signal, said parabolic waveform signal, and said n-t
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