With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: Opposition leaders Mir Hossein Mousavi and Mehdi Karoubi have called on supporters to take part in peaceful protests to mark the June 12 election , which returned President Mahmoud Ahmadinejad to power .
text_B: Karoubi is a time on the clock
not-entailed.