Such-and-such

It's a poor system, because if you want to do such-and-such, you must first find that function in a long and disorderly list.

[…] it has answered numerous questions as to what such-and-such a locomotive designer would have done, to keep pace with increasing demand for tractive power, had he held office for just a little longer.

We always rub our hands too much / We know the reasons, but such and such

I am troubled by the rush of young researchers attempting to prove that females are not inferior to males in such-and-such an ability or such-and-such a trait, especially when it is by no means clear what difference it makes.