"Variations of two earlier meters [is the variation] of a mātrā-vṛtta. For example, for [a meter of] three [morae], variations of two earlier meters, one and two, being mixed three happens. For [a meter] of four [morae], variations of meters of two morae [and] of three morae being mixed, five happens. For [a meter] of five [morae] variations of two earlier [meters] of three morae [and] of four morae. being mixed, eight is obtained. In this way, for [a meter] of six morae, [variations] of four morae [and] of five morae being mixed, thirteen happens. And like that, variations of two earlier meters being mixed, [variations of a meter] of seven morae [is] twenty-one. In this way, the process should be followed in all mātrā-vṛttas."