Regarding, re.
Abbreviation of "recursively enumerable"; the class of decision problems for which a 'yes' answer can be verified by a Turing machine in a finite amount of time.
In accordance with, as per
For each.
By the, by means of the, via the, through the.
To each, in each (used in expressing ratios of units).
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.
Belonging to per, their (singular). Gender-neutral third-person singular possessive adjective, coordinate with gendered his and her.