Belonging to per, their (singular). Gender-neutral third-person singular possessive adjective, coordinate with gendered his and her.
For each.
To each, in each (used in expressing ratios of units).
By the, by means of the, via the, through the.
In accordance with.
They (singular). Gender-neutral neologistic third-person singular subject pronoun, coordinate with gendered pronouns he and she.
Them (singular) Neologistic gender-neutral third-person singular object pronoun, suggested for use in place of him and her.