In the fall of 1958, Nasser formed a tripartite committee consisting of Zakaria Mohieddin, al-Hawrani, and Salah Bitar to oversee developments in Syria. By moving the latter two, who were Ba'athists, to Cairo, he neutralized important political figures who had their own ideas about how Syria should be run. He put Syria under Sarraj, who effectively reduced the province to a police state by imprisoning and exiling landholders who objected to the introduction of Egyptian agricultural reform in Syria, as well as communists. Following the Lebanese election of Fuad Chehab in September 1958, relations between Lebanon and the UAR improved considerably. On 25 March 1959, Chehab and Nasser met at the Lebanese–Syrian border and compromised on an end to the Lebanese crisis.
In what year did Nasser and Chehab agree to end the Lebanon crisis? (If the question is unanswerable, say "unanswerable")
1959