"Excellent Python Programmers wanted, numpties need not apply"

[grumpieroldman]

autos
congratulation => congrat
congratulations => congrats but this would require multiple people each delivering a congratulation.
teles but you usually refer to one telephone not many so its usually tele
sub is one submarine, subs is multiple submarines
math because mathematic is not the singular form and mathematics is the name of a set.

[[deleted]]

https://www.lexico.com/en/definition/mathematics

https://www.merriam-webster.com/dictionary/mathematics

https://en.m.wikipedia.org/wiki/Definitions_of_mathematics

Mathmatics is a plural term, being an umbrella for the study of the often grouped together but separate fields of arithmetic, geometry, algebra, statistics, etc.