A digital system and method of operation is provided in which several processors are connected to a shared cache memory resource. A human activator enzyme, termed ASA, of acid a a-glycosidase, or acid maltase, a lysosomal enzyme, is specifically defined and characterized. A combining unit performs logic operations using the similarities between the key contents and the retrievable contents, calculating combined scores for the respective retrievable contents. Therefore, the database has the searchable text contents, i. Preferably, the adjustment pad has a thin section and a thick section which are placed selectively within the foot portion to vary the fitting of the shell.