Tarkovsky wrote the screenplay during his entrance examination at the State Institute of Cinematography (VGIK) in a single sitting.
tɑːɹkˈɑːvski ɹˈoʊt ðə skɹˈiːnpleɪ dˈʊɹɹɪŋ hɪz ˈɛntɹəns ɛɡzˌæmᵻnˈeɪʃən æt ðə stˈeɪt ˈɪnstɪtˌuːt ʌv sˌɪnɪmɐtˈɑːɡɹəfi vˈiːdʒˈɪk ɪn ɐ sˈɪŋɡəl sˈɪɾɪŋ.