1799
Many products are made from metals because of the needs for strength and accuracy .
 material: metals; machanical property: strength; process characterization: accuracy
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: metals, strength, accuracy 
Answer:
 material: metals; machanical property: strength; process characterization: accuracy