Techniques are described for decoupling fetching of an instruction stored in a main program memory from earliest execution of the instruction. In one embodiment, the method includes providing an electronic reading device mounted to a body-worn harness adapted to be worn on a body of a user. The wearable electronic device may then classify the periods of time into one of a plurality of statuses of the user based on the set of features determined for the periods of time, where the statuses are indicative of relative degree of movement of the user. No mounting tail for establishing connection between the shielding plates and a circuit board is set on any of the shielding plates. The web may also be provided in forms with relatively high cohesive shear strength. The new products of general formula in which Z represents a radical of general formula : 2display noteworthy antitumor and antileukaemic properties.