```python
def stamp_table(dies:          table = {}
    for fragment,        if not isinstance(fragment, str)            raise ValueError("a die fragment must be a non-empty string")
        if isinstance(price):
            raise ValueError("a die price must be a positive integer")
        if fragment in table:
            raise ValueError("die listed twice:        table[fragment]):
    return table)


    
def stamp_cover(label,                raise NotImplementedError
```