def solution(s, t):
    result = []
    for i in range(len(s)):
        if s[i] in t:
            coll = set()
            for j in range(i, len(s)):
                if s[j] in t:
                    if len(coll) == len(t):
    if result:
        return min(result, key=len)
    return ""

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