Share 'USING STREAM GATE?'

Hi everybody.. I'm starting this discussion only to ask about how to use a stream component.. The issue is that I don't understand exactly what's a gate and how it may help to manipulate data...And i0ve been surfing the discussions but I still don't get it.. I'm attaching an image.. It's very simple. I would like to have in each list at the end only one value (coresponding to it.. 0 in list 0,…