7607
A response surface design of experiments was built to evaluate the influence of the different variables and their interactions on each response , and to select the type of extrusion which provides the best results in terms of product quality , the one which shows less influence on the product after scale - up ( " scalability " ) and when the formula used changes ( " robustness " ) , and the one which allows the possibility to adjust pellet properties with spheronization variables ( " flexibility " ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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