{HEAD ~ The thin package} forms {TAIL ~ a complete modular unit}, in the form of a small “card”, complete with electrodes 
{ HEAD ~ The thin package } forms { TAIL ~ a complete modular unit } , in the form of a small “ card ” , complete with electrodes
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH