With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: The series was based on the Russky Vityaz, the world 's first four - engined aircraft, designed by Igor Sikorsky.
text_B: The series was based on the Russky Vityaz or Le Grand, the world's first four-engined aircraft, designed by Igor Sikorsky.
neutral.