A first gate and a second gate are preferably PMOS and NMOS transistors, respectively, formed in an n-type well and a p-type well. The containment sheets are formed from sheet metal and are designed to receive a poured in settable material such as concrete. The wastewater treatment system treats wastewater from the gas purifier via the use of ultraviolet light. The sensors detect a deviation of the paper with respect to the feeding direction. The grommet defines an aperture extending therethrough which communicates with the valve port. In case of a chiral halomethyl substrate, the resulting chiral diol sulfone derivative is suitable as a building block for statin type compounds.