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Abc c. ABCD. BCD. Буквы ABCD. ¬(B → A) ∧ (C → D) ≠ (A ∧ B ∧ C ∧ ¬D)..
ABCD. BCD. Буквы ABCD. ¬(B → A) ∧ (C → D) ≠ (A ∧ B ∧ C ∧ ¬D)..