A liquid crystal display panel simplifying its testing and manufacturing. Embodiments of those methods include forming a conformal layer of a water soluble nanopowder on a wafer, and then scribing the wafer. The branch selector 16 selects a branch of highest priority in priority information 29 from branches of which a data detection signal 25 indicates that the data is valid and of which the number of error symbols 22 coincides with a minimum value. The tests are initiated by asserting a test mode activate and first, second, and third test mode enable signals, respectively, which enable reuse of test patterns across different electronic circuits. The preparation method comprises repeatedly mixing tramadol or its salt with the acidic substance, and moistening the mixture and formulating the mixture under an energy input, such as heat or pressure.