Belonging to hir, their (singular). Gender-neutral third-person singular possessive adjective, coordinate with his and her.
Getting down to cases now, a child's learning, L, in the sixth grade will be a function of a number, say k, of variables X1 X2, X3, ... Xk representing hir (hir is an abbreviation for his or her and is pronounced here) previous education, motivation, rapport with teachers, peers' atitudes toward education, teachers' ability, and so on.
Blend of him/his + her.
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