[Petteri]

4 handed open-raise from CO or Button.

Any pair
Any Ace
Any 2 cards higher than 9.
Add some suited connectors to mix up play.

Re-raise from Button:
AA-77
AK-AT
KQ
Add some other suited hands to mix up your play

Your total PFR should be around 20-25 % if you play mainly 3-4 handed.