Julia:生成具有重复项的集合中的所有非重复排列

function generate_permutations(collection)
    if length(collection) == 0
        return [[]]
    end
    
    permutations = []
    used_elements = []
    
    for i in 1:length(collection)
        if collection[i] in used_elements
            continue
        end
        
        element = collection[i]
        remaining_elements = collection[1:i-1] + collection[i+1:end]
        
        sub_permutations = generate_permutations(remaining_elements)
        
        for sub_permutation in sub_permutations
            permutation = [element; sub_permutation]
            push!(permutations, permutation)
        end
        
        push!(used_elements, element)
    end
    
    return permutations
end

3-element Vector{Vector{Int64}}:
 [1, 2, 2]
 [2, 1, 2]
 [2, 2, 1]