With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: The ICU, a radical trade union, started in South Africa in 1919, but spread into neighboring colonies in the 1920s and 1930s.
text_B: The ICU, a radical trade union, spread into neighboring colonies in the 1920s and 1930s.
entailment.