Creating an object of the Magmatic Algebras category

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For the moment being, the category of Sage for nonassociative algebras is called MagmaticAlgebras. I want to know which methods are available in this category, and specifically how to create an object (i.e., a nonassociative algebra). In particular, what I want is to get the free nonassociative algebra in four variables (a,b,c,d) over the rational field. The MagmaticAlgebras reference page is of no use to me. Thank you!