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Sum Odd Numbers in Range

Write a Python function `sum_in_range(l, r)` that calculates the sum of all odd natural numbers within the inclusive range `[l, r]`.

#### Example Usage
```python [main.nopy]
print(sum_in_range(2, 5))  # Output: 8
print(sum_in_range(5, 7))  # Output: 12
print(sum_in_range(7, 13)) # Output: 40
```
def sum_in_range(l, r):
    """
    Calculate the sum of all odd natural numbers within the inclusive range [l, r].

    Args:
    l (int): The lower bound of the range.
    r (int): The upper bound of the range.

    Returns:
    int: The sum of all odd natural numbers within the range.
    """
    # Placeholder for the solution
    pass