The present invention relates to an insert for reinforcement of bags made of plastic film, comprising a star-like plastic part having at least three jaws, wherein the insert is adapted for insertion and heat-sealing at a junction inside a three-dimensional bag where at least three plastic films meet, so that each jaw extends in a direction between two films. It has a scavenger passage connected to a branching scavenger passage opened to said scavenging port. Logic functions of memory element outputs in the circuit are viewed as a whole, rather than as separate functions for each input.