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def solution(digits):
    from itertools import combinations
    # Generate all possible combinations of up to 3 digits
    max_number = 0
    for r in range(1, 4):  # from 1 digit to 3 digits
        for combo in combinations(digits, r):
            # Convert tuple of digits to integer and check if it's the largest found so far
            num = int(''.join(map(str, combo)))
            if num > max_number:
                max_number = num
    return max_number