{HEAD ~ The characteristics} of jitter include the level of error, {TAIL ~ the frequency} of change in the error and whether the change is periodic or random 
include
{ HEAD ~ The characteristics } of jitter include the level of error , { TAIL ~ the frequency } of change in the error and whether the change is periodic or random
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH