add a new dependency - this allows x +- y -- z to mean what you thinbk it should
add a new par depy a -> (b,c)
add a new dependency
reroute - this allows x --: y --: z to mean what you thinbk it should
par depy a -> (b,c)
reroute all links to z - x --> y --> z doens't mean what you may think, see --:
a modifyable graph - use the defined operators to change it