With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: His unwillingness to yield to domestic and international pressure to step down led to heightened political tensions that culminated in September 2009 when presidential guards opened fire on an opposition rally killing more than 150 people , and in early December 2009 when CAMARA was wounded in an assassination attempt and evacuated to Morocco and subsequently to Burkina Faso .
text_B: December is a month
entailed.