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