def get_permutations(arr):
    # Write your code here
    result=[]

    def helper(remaining,slate):

        if(len(remaining)==0):
            result.append(list(slate))
            return

        for i in range(len(remaining)):
            slate.append(remaining[i])
            helper(remaining[:i] + remaining[i+1:], slate)
            slate.remove(remaining[i])

    helper(arr,[])
    return result


print(get_permutations(["A","B","C"]))