ðˈɛn, ðɛɹ ɪz nˈoʊ mˈɛkənˌɪzəm wˌɪtʃ sˈæɾɪsfˌaɪz ðə fˈoːɹ pɹˈɑːpɚɾiz mˈɛnʃənd əbˌʌv ˌaɪˈɑːɹ, dˌʌbəljˌuːbˌiːbˈiː, nˈiːk ænd pˈiː.
then, there is no mechanism which satisfies the four properties mentioned above (IR, WBB, NEIC and PE).