Draw a line with stroke shape
Reverse direction of the clone [you can now set keystroke for this in pro]
Experiment changing the stroke shape of the clone and/or original [using page and layer gallery to select may make this easier] - having them different color/shades can help to see the effect
You can also adjust their weights individually
You can also try it without reversing the clone direction
When you have a combination you like you can use them as future reference [copy then paste attributes into your drawing for each line]
And you can try it with more than one clone.....