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Write a Python function `is_sublist(main_list, sub_list)` that checks whether `sub_list` is a sublist of `main_list`. A sublist is defined as a sequence of elements that appear in the same order in the main list, without any gaps.
#### Function Signature
```python [main.nopy]
def is_sublist(main_list: list, sub_list: list) -> bool:
pass
```
#### Input
- `main_list`: A list of elements (e.g., integers, strings, etc.).
- `sub_list`: A list of elements to check as a sublist.
#### Output
- Returns `True` if `sub_list` is a sublist of `main_list`, otherwise `False`.
#### Example Usage
```python [main.nopy]
is_sublist([1, 2, 3, 4], [2, 3]) # True
is_sublist([1, 2, 3, 4], [3, 2]) # False
is_sublist([1, 2, 3, 4], [5]) # False
is_sublist([1, 2, 3, 4], []) # True
```def is_sublist(main_list: list, sub_list: list) -> bool:
"""
Check if sub_list is a sublist of main_list.
Args:
main_list (list): The main list to check within.
sub_list (list): The list to check as a sublist.
Returns:
bool: True if sub_list is a sublist of main_list, False otherwise.
"""
# Placeholder for the solution
pass