ズンドコキヨシ with Swift

変数（var）は使用しない縛りで

import Foundation

let zundoko = ["ズン", "ドコ"]
let ex = ["ズン", "ズン", "ズン", "ズン", "ドコ"]

func zunzunzundoko(list: [String])
{
    if list == ex {
        print("キ・ヨ・シ！")
        return
    }
    
    let t = zundoko[Int(arc4random_uniform(2))]
    print(t)
    
    zunzunzundoko(list[1...4] + [t])
}

zunzunzundoko(["", "", "", "", ""])

普通？