useless ligatures


Hi everyone, I'm currently making a font with as many ligatures as possible, the combinations are endless, but I still want them to be usable.

So I was reading a very old topic about the 'ffj' ligature. And thought: That is completely useless.

Or is it?

Now I am really doubting to put in the 'ffj' ffb' 'ffk' 'ffh' in. They look nice, but:

- in what language are they actually used?
- in what fonts are these ligatures included? (and why)