1924
A simple critical overhang angle was imposed into the TO process as a constraint .
 manufacturing process: simple; process parameter: overhang angle; concept or principle: process; material: as
Please list all entity words in the text that fit the category.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} 
Answer:
 manufacturing process: simple; process parameter: overhang angle; concept or principle: process; material: as