With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: In 1925 he began teaching as professor (without full chair) at Breslau, but in 1928 he took a long-term leave and returned to Turkey.
text_B: In 1925 he began teaching as professor without full chair at Breslau.
entailment.