550
To increase the flexibility of the process , it seems viable to use highly productive additive manufacturing processes such as wire-arc additive manufacturing ( WAAM ) to produce pre-forms for the ring rolling process .
 machanical property: flexibility; concept or principle: process; manufacturing process: additive manufacturing processes; material: as; manufacturing process: additive manufacturing; manufacturing process: WAAM; manufacturing process: ring rolling; concept or principle: process
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:
 machanical property: flexibility; concept or principle: process; manufacturing process: additive manufacturing processes; material: as; manufacturing process: additive manufacturing; manufacturing process: WAAM; manufacturing process: ring rolling; concept or principle: process