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We demonstrate that the printed conductive complex structures as hollow capacitive sensor , electrically activated shape memory composites , stretchable circuits , showing the versatility of DLP® 3D printing for conductive complex structures .
 machine or equipment: printed conductive; concept or principle: complex structures; material: as; machine or equipment: sensor; concept or principle: electrically; material: composites; engineering feature: stretchable; manufacturing process: 3D printing; engineering feature: conductive complex structures
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: printed conductive, complex structures, as, sensor, electrically, composites, stretchable, 3D printing, conductive complex structures 
Answer:
 machine or equipment: printed conductive; concept or principle: complex structures; material: as; machine or equipment: sensor; concept or principle: electrically; material: composites; engineering feature: stretchable; manufacturing process: 3D printing; engineering feature: conductive complex structures