3,2, basic attacks.
Basic attack combo:
3, basic attack, 2, basic attacks.
Ice Wall combo:
3,1 (behind the target), 2, basic attacks.
3, 2, 4 (you can use basic attacks between the skills).
Blink Rune combo:
You can start one of the previous combos with Blink Rune.
You can combine these combos the way you like.