With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: In solid - state physics, heavy fermion materials are a specific type of intermetallic compound, containing elements with 4f electrons in unfilled electron bands.
text_B: In solid-state physics, heavy fermion materials are a specific type of intermetallic compound, containing elements with 4f or 5f electrons in unfilled electron bands.
neutral.