| http://www.w3.org/ns/prov#value | - On an electric guitar or other musical instrument where the strings are neither parallel nor co-planar, the transverse plane is defined at each string as the plane that is perpendicular to the string; the horizontal axis is defined as the line in the transverse plane that is tangent to the surface formed by the strings; and the vertical axis is defined as the axis in the transverse plane that is p
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