An index to a plurality of entities is built, where each entity is represented by a point defined in a space. The printing unit includes a carrier that is dimensioned to approximate a PCMCIA memory card. At least one of the nodes stores data for mapping multidrop addresses to network addresses. It is suggested to partially replace the preprocessing step by a measurement of the optical signal, whereby the measurement comprises transmitting or reflecting the optical signal by an optical element, thereby weighing the optical signal by a spectral weighing function. The present invention also provides the use of the above compounds as pharmaceuticals, pharmaceutical compositions containing the compounds and processes for preparing the compounds. The lure is activated by the rescuer and tossed a short distance away from the attack site to draw the attacking bees, together with newly arriving bees, away from the victim and the rescuer.