def text_match_three(text):
        import re
        
        patterns = 'ab{3}?'
        if re.search(patterns,  text):
                return 'Found a match!'
        else:
                return('Not matched!')
def is_not_prime(n):
    import math
    
    result = False
    for i in range(2,int(math.sqrt(n)) + 1):
        if n % i == 0:
            result = True
    return result