sˈɪns ˈɛvɹi nˈɑːnˈɛmpti ˈoʊpən sˈɛt kəntˈeɪnz pˈiː, nˈoʊ klˈoʊzd sˈɛt nˌɑːt kəntˈeɪnɪŋ pˈiː sˈʌtʃ ɐz ˈɛks bˈækslæʃ pˈiː kæn biː sˈɛpɚɹˌeɪɾᵻd baɪ nˈeɪbɚhˌʊdz fɹʌm pˈiː, ænd ðˈʌs ˈɛks ɪz nˌɑːt ɹˈɛɡjʊlɚ.
Since every non-empty open set contains p, no closed set not containing p (such as X \ {p}) can be separated by neighbourhoods from {p}, and thus X is not regular.