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Pairwise Addition of Tuple Elements

Write a function `add_pairwise` that takes a tuple of integers as input and returns a new tuple containing the pairwise addition of neighboring elements in the input tuple.

#### Example Usage
```python [main.nopy]
add_pairwise((1, 5, 7, 8, 10)) # returns (6, 12, 15, 18)
```

#### Constraints
- The function should handle tuples of any length greater than 1.
- If the input tuple has less than 2 elements, return an empty tuple.
- Use tuple comprehensions or other efficient methods to achieve the result.
def add_pairwise(test_tup):
    """
    Compute the pairwise addition of neighboring elements in the tuple.

    Args:
        test_tup (tuple): A tuple of integers.

    Returns:
        tuple: A tuple containing the pairwise sums of neighboring elements.
    """
    # Placeholder for the solution
    pass
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