1781
We use a simple basic lattice shape composed of pillars , optimizing only its density distribution by setting the pillar diameter as the design variable .
 manufacturing process: simple; concept or principle: lattice; machanical property: density distribution; concept or principle: diameter; material: as; engineering feature: design
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: simple, lattice, density distribution, diameter, as, design 
Answer:
 manufacturing process: simple; concept or principle: lattice; machanical property: density distribution; concept or principle: diameter; material: as; engineering feature: design