8897
This research discusses a preliminary investigation into the use and control of soluble polymer compounds and additive manufacturing to fabricate sacrificial molds .
 concept or principle: research; concept or principle: soluble; material: polymer; manufacturing process: additive manufacturing; manufacturing process: fabricate; machine or equipment: molds
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: research, soluble, polymer, additive manufacturing, fabricate, molds 
Answer:
 concept or principle: research; concept or principle: soluble; material: polymer; manufacturing process: additive manufacturing; manufacturing process: fabricate; machine or equipment: molds