A compound hinge system includes a first link and a second link. Moreover the invention is directed to pharmaceutical compositions useful for the treatment or alleviation of diseases or disorders associated with the activity of potassium channels. The four transform coefficient strings are combined into an 8×8 block of entropy-decoded sixty four transform coefficients by de-interleaving the four strings in such a manner as to select a lower frequency transform coefficient alternately from the four strings and arrange it in the 8×8 block in an order of a low frequency to a high frequency.