sorting

[Dimitry Grigoryev]

Hi!
When I tried to sort my file using numeric and alphabetic keys at the same
time, it worked for sorting numeric first and alphabetic second.

sort  -k 3n -k 4 file

But I could not make it work other way around.

sort  -k 2 -k 3n file

What's doing on?

Thank you

Dmitry