The first three treatises form the core of the logical theory stricto sensu: the grammar of the language of logic and the correct rules of reasoning.
ðə fˈɜːst θɹˈiː tɹˈiːɾɪzᵻz fˈɔːɹm ðə kˈoːɹ ʌvðə lˈɑːdʒɪkəl θˈiəɹi stɹˈɪktoʊ sˈɛnsuː: ðə ɡɹˈæmɚɹ ʌvðə lˈæŋɡwɪdʒ ʌv lˈɑːdʒɪk ænd ðə kɚɹˈɛkt ɹˈuːlz ʌv ɹˈiːzənɪŋ.