1.   Before a packed audience, two key combatants faced off at the annual meeting of the American Association for the Advancement of Science, which ended Tuesday.

2.   First, the key combatants must review the package, whose sheer immensity makes it a welcome prospect only for diehard number crunchers.

3.   Leaders of the various factions have sent their deputies and the groups involved represent only the key combatants and prominent exile groups.

4.   The groups in Germany for three-to-five days of talks represent only the key combatants and prominent exile groups.