{HEAD ~ the quantity} of {TAIL ~ knives} included in the first and second sets being dissimilar relative to each other 
of
{ HEAD ~ the quantity } of { TAIL ~ knives } included in the first and second sets being dissimilar relative to each other
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH