1762
Alternative operations of adding and subtracting material and functions are sometimes considered to improve manufacturing efficiency , as an alternative solution to conventional methods like welding and machining .
 material: material; manufacturing process: manufacturing; material: as; concept or principle: solution; manufacturing process: welding; manufacturing process: machining
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:
 material: material; manufacturing process: manufacturing; material: as; concept or principle: solution; manufacturing process: welding; manufacturing process: machining