In some embodiments, {HEAD ~ the original body part index} of {TAIL ~ a synthesized pixel} may be nil if the synthesized pixel does not correspond to a body part of the target  
In some embodiments , { HEAD ~ the original body part index } of { TAIL ~ a synthesized pixel } may be nil if the synthesized pixel does not correspond to a body part of the target
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH