.
<put algorithm description here>
processing.runalg('qgis:clip', input, overlay, output)
<put algorithm description here>
processing.runalg('qgis:difference', input, overlay, output)
<put algorithm description here>
processing.runalg('qgis:intersection', input, input2, output)
<put algorithm description here>
processing.runalg('qgis:lineintersections', input_a, input_b, field_a, field_b, output)
<put algorithm description here>
processing.runalg('qgis:symetricaldifference', input, overlay, output)
<put algorithm description here>
processing.runalg('qgis:union', input, input2, output)