How many possible outcomes exist for flipping two coins?
When flipping two coins, there are four possible outcomes: 

1. Heads, Heads (HH)
2. Heads, Tails (HT)
3. Tails, Heads (TH)
4. Tails, Tails (TT)
Complete the following task based on the instruction and optional input provided.### Instruction:
How many possible outcomes exist for flipping two coins?

### Output:
When flipping two coins, there are four possible outcomes: 

1. Heads, Heads (HH)
2. Heads, Tails (HT)
3. Tails, Heads (TH)
4. Tails, Tails (TT)