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