An m-to-n concentrator constructed from smaller concentratorsorters wherein m is not necessarily equal to 2n. The pivotal portion of the head includes a fore part and a rear part with reference to a ratcheting direction of the handle. The cascode stage may receive a first voltage and may be connected to the input stage. Also provided are kits for use in preparing the subject compositions, and compositions produced by the methods. This invention thus relates to the seeds of soybean variety XB25C05, to the plants of soybean XB25C05 to plant parts of soybean variety XB25C05 and to methods for producing a soybean plant produced by crossing plants of the soybean variety XB25C05 with another soybean plant, using XB25C05 as either the male or the female parent. In each iteration of the oscillator, a sum of the squares of past sine and cosine values is used as a negative feedback term in synthesizing next sine and cosine values, in order to stabilize the amplitudes of the sine and cosine values.