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8 year oldThe announcement is seen as one of the last steps before a full peace deal is signed, which is expected within weeks.
Colombia's president and the Farc leader shook hands in celebration.
The longest-running insurgency in the Western Hemisphere left an estimated 220,000 people dead and almost seven million displaced.
The announcement in Havana caps formal peace talks that started three years ago in the Cuban capital.
The Farc in the 21st Century is a strange beast.
Gone is the bipolar vision of the Cold War, and gone too are most of the group's original intellectual architects, many killed in combat.
Today, somewhat anchorless, the rebels continue to go through motions of an armed insurgency but they know a new future is beckoning.
They remain primed for war - machine guns by their beds, handguns under their pillows, all night lookouts keeping watch for an enemy that no longer seems to be searching for them.
But it does not mark the start of the ceasefire, which will only begin with the signing of a final accord.
Colombia's President, Juan Manuel Santos, has previously said he hopes to sign that accord by the end of July.
Thursday's announcement includes:
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