7731
To showcase the versatility of this approach , several applications were demonstrated , including unique artistic illumination , caustic patterns , beam splitter and combiner on both planar and 3D conformal surfaces , and optical encoder .
 machine or equipment: beam; concept or principle: 3D; concept or principle: surfaces; machine or equipment: optical encoder
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: beam, 3D, surfaces, optical encoder 
Answer:
 machine or equipment: beam; concept or principle: 3D; concept or principle: surfaces; machine or equipment: optical encoder