Using the gender element system, elements can be combined, making two element combinations. The elements being combined are eluvian (feminine/water), fervian (masculine/fire), tellusian (neutral/earth), ventulian (undefined/air), alterian (xenine/spirit).
A person with two gender elements may be fluid between the two, or the their element's may be static. Their element may be a 50/50 split between the two of them, or it may be unequal.