What combat combos are available in Batman: Arkham City Lockdown? The tutorial teaches you two:
→ ↑
→ ← → ←
It then urges me to discover others. To this point, I haven't found any. My usual tactics are to wait for an enemy to attack, swipe ↓ to deflect, then use the → ← → ← combo.
What other combos are there? What are the most powerful?