Assertion: vegetable oil's level | /r/CapableOf | build symmetric factorial
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Source sentences:
text: To build a symmetric factorial, the four levels of anhydride molar ratio were grouped into low (non-stoichiometric and stoichiometric levels, 0·8:1·0 and 1·0:1·0) and high (stoichiometric excess, 1·4:1·0 and 1·2:1·0) levels.