Unit9

something likes this?
make some abstract classes logicunit and logicruleunit

class lines extends logicunit{
   //store all the line "predicates"
  Line[] lines = unit4.getLines();

}
class unitx  extends logicruleunit{
       public void refresh(){
        lines.getLines(i)
         //keep only the horizontal lines
         if( lines[i].dot1.x == lines[i].dot2.x){  horizontallines.store(lines[i]);
    }
}

class horizontallines extends logicunit{

}
...