@musa-5 My general theory is (and I think you will see this in the tutorials section), is filters go above as you can filter multiple trees from 1, they do work below and sometimes this is necessary, blue blocks go at top but possibly under a filter, this is where they seem to work best and prevents the EA from doing work when it doesn't need to. so basically as the logic works from the top down one block at a time, your better to stop the flow as soon as possible.