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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 .
 material: ink; material: graphene; concept or principle: process; manufacturing process: 3D print; concept or principle: structure
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: ink, graphene, process, 3D print, structure 
Answer:
 material: ink; material: graphene; concept or principle: process; manufacturing process: 3D print; concept or principle: structure