from typing import List
def remove_duplicates(numbers: List[int]) -> List[int]:
    import collections
    c = collections.Counter(numbers)
    return [n for n in numbers if c[n] <= 1]
from typing import List
def has_close_elements(numbers: List[float], threshold: float) -> bool:
    for idx, elem in enumerate(numbers):
        for idx2, elem2 in enumerate(numbers):
            if idx != idx2:
                distance = abs(elem - elem2)
                if distance < threshold:
                    return True
    return False