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Here , development of a graphene-silicone ink , so-called MJ-3DG , with a high content of graphene ( 70 wt % ) and its adoption for the PPMJ process to 3D print a highly conductive graphene-silicone structure is demonstrated .
 ink, graphene, process, 3D print, structure
Please list all entity words in the text that fit the category. Output format is "word1, 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} 
Answer:
 ink, graphene, process, 3D print, structure