{HEAD ~ The entirety} of the body region within the crystalline material can be within {TAIL ~ a single crystal} of the material 
within
{ HEAD ~ The entirety } of the body region within the crystalline material can be within { TAIL ~ a single crystal } of the material
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH