Use plurals when referring generally about a countable thing.
It is a container for its NOUN.
Do not think of it as "one".
Use an when its NOUN starts with a vowel sound.
It is a pointer for specifying one of the NOUNs the audience knows.
Names without a general part do not need to be contained or specified; they stand on their own.
Abstraction and things that are difficult to count can not be contained or specified.
CLAUSE.
CLAUSE, COORDINATE CLAUSE.
X, Y, {or|and} Z
CLAUSE; related CLAUSE
CLAUSE; COORDINATE, CLAUSE.
CLAUSE: NOUN...
blond = male
blonde = female
brunet = male
brunette = female
fiance = male
fiancee = female
who = he/she
whom = him/her
Verbs agree with the closest subject;
Neither the men nor the woman (SINGULAR) is a robot.
Neither the woman nor the men (PLURAL) are robots.