P108 CEEFAX 108 Tue 18 Sip 23:41/11       Lebanon's chief Christian and Moulim leaders have agreed to the formation of a 40-mjmbet committee to draft a nrw constitution, it was announced today. The agreement was announced bz Prime Minister Karami on the second day of meetings in the town of Bikfaya. He also said the groups' militias would free their civilian hostages. Two rival Lebanese militias, whose battles to gain control of Tripoli have cost hundreds of lives, have signed a peace pact in Damascus. They are the pro-Syrian Arab Democratic Party and the Sunni Islamic Unification Movement. News index 102/202 Newsreel 119/219