With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: At seventeen or eighteen years of age, he joined Plato's Academy in Athens and remained there until the age of thirty-seven (c. 347 BC).
text_B: At seventeen years of age, he joined Plato 's Academy in Athens and remained there until the age of thirty - seven c. 347 BC.
entailment.