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The Taliban have staged devastating attacks in the capital of Afghanistan, Kabul, in recent weeks. And a BBC study has discovered the group is active across the majority of the country \\u2013 pushing beyond its traditional southern stronghold into eastern, western and northern parts. Seventeen years after the Taliban were toppled by a US-led invasion, it is clear the insurgent group has not been defeated. Why are the Taliban so resilient?

Presenter: Helena Merriman\\nProducers: Ruth Alexander and Josephine Casserly