QRGROUP could has a multiple fields in the property expression in quickreports delphi

Question

In quick report in Delphi how can I use a multiple data fields in qrgroup expression property?

For example I have a table like this one:

student  departement   entry year
---------------------------------
1        math          2016
2        math          2017
3        physique      2017
4        math          2016
5        physique      2018

I want to regroup my report using departement and entry year.

How can I use it in qrgroup expression property?

Thanks guys