from typing import Counter


def count_co_occurrence(matches):
    """Find co-occurrence of elements in a dictionary.
    
    Args:
        matches (dict)
    
    Return:
        count_dict (dict): Dictionary where the values are Counter objects.
    
    """
    count_dict = {}
    for key, val in matches.items():
        count_dict[key] = Counter(val)
    
    return count_dict