In {TAIL ~ addition}, {HEAD ~ the risk} can be factored into the initial planning stage so as to include an expected predictive error in the initial planning 
In { TAIL ~ addition } , { HEAD ~ the risk } can be factored into the initial planning stage so as to include an expected predictive error in the initial planning
REL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH