{HEAD ~ The discs} may include {TAIL ~ perimeters} having ovular or elliptical shapes that cooperate with a cylindrical interior wall of the housing to cut tissue specimens 
include
{ HEAD ~ The discs } may include { TAIL ~ perimeters } having ovular or elliptical shapes that cooperate with a cylindrical interior wall of the housing to cut tissue specimens
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH