{HEAD ~ The device structure} allows {TAIL ~ the display} to be easily visible by the user and insertion of the cartridge is easily accessible and visible during use 
allows
{ HEAD ~ The device structure } allows { TAIL ~ the display } to be easily visible by the user and insertion of the cartridge is easily accessible and visible during use
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH