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The first method to create a three-dimensional object layer by layer using computer-aided design ( CAD ) was rapid prototyping , developed in the 1980s to produce models and prototype parts .
 concept or principle: three-dimensional; concept or principle: layer by layer; enabling technology: computer-aided design; enabling technology: CAD; enabling technology: rapid prototyping; concept or principle: prototype
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:
 concept or principle: three-dimensional; concept or principle: layer by layer; enabling technology: computer-aided design; enabling technology: CAD; enabling technology: rapid prototyping; concept or principle: prototype