<Tr> <Td> I: </Td> <Td> R </Td> <Td> RI </Td> <Td> </Td> </Tr> <P> However, there are only a few numbers by which one may multiply a row and still end up with twelve tones . (Multiplication is in any case not interval - preserving .) </P> <P> Derivation is transforming segments of the full chromatic, fewer than 12 pitch classes, to yield a complete set, most commonly using trichords, tetrachords, and hexachords . A derived set can be generated by choosing appropriate transformations of any trichord except 0, 3, 6, the diminished triad . A derived set can also be generated from any tetrachord that excludes the interval class 4, a major third, between any two elements . The opposite, partitioning, uses methods to create segments from sets, most often through registral difference . </P> <Dl> <Dd> Main article: Combinatoriality </Dd> </Dl>

Which of the following terms are associated with the twelve-tone system