```python
def run_decode(coded: str) -> str:
    """
    Decode a run of characters where each character is followed by a number indicating how many times it repeats.
    
    Parameters:
    - coded (str): A string where each character is followed by a number indicating how many times it repeats.
    
    Returns:
    - str: A string representing the decoded sequence of characters.
    """
    decoded = ''
    for i in range(0, len(coded), 2):
        letter = coded[i]
        count = int(coded[i+1])
        decoded += letter * count
    return decoded
```