The invention provides a method and apparatus for reducing the energy needed to process stillage in an ethanol refining operation. The method allows accurate forming of pre-determined pattern at high production speed. The dynamic sidewall is rotatable between a collapsed state and an expanded state. In various embodiments, the light fixture is capable of transitioning from a deployed position where the mast engages the deployment region and a transport position where the mast and light fixture are disposed within the transport region. The invention furthermore is directed to a process for the preparation of the compound of formula I, and pharmaceutical preparation comprising it. Address offset values are provided in programmable offset registers, with a multiplexer circuit and a selection and combination circuit, on the basis of input signals which are fed in at low frequency and in parallel by the test unit.