`dict_a` and `dict_b` are two dictionaries. Write code that "combines" their key-value pairs to create a dictionary named `combined_dict` (with `dict_b` taking precedence when there are conflicts). For example, if `dict_a` is `{'x': 1, 'y': 2}` and `dict_b` is `{'y': 3, 'z': 4}` then `combined_dict` should be `{'x': 1, 'y': 3, 'z': 4}`.