@Test
    fun twelveTest() {

        for(i in 0..100){
            val size = Random.nextInt(1000)
            val ans = ArrayList<String>()
            val table = HashMap<String, Int>()
            for(i in 0..size){
                val key = randomString(Random.nextInt(100,1000))
                val value = Random.nextInt()
                if(value >= 0)
                    ans.add(key)
                table[key] = value
            }
            assertEquals(ans.toList().sorted(), twelve(table).sorted())
        }
    }