We describe {HEAD ~ a system} of electronically active inks which may include electronically addressable contrast media, conductors, insulators, resistors, semiconductive materials, magnetic materials, spin materials, piezoelectric materials, {TAIL ~ optoelectronic, thermoelectric or radio frequency materials} 
We describe { HEAD ~ a system } of electronically active inks which may include electronically addressable contrast media , conductors , insulators , resistors , semiconductive materials , magnetic materials , spin materials , piezoelectric materials , { TAIL ~ optoelectronic , thermoelectric or radio frequency materials }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL