Allowing stacking

Olympia: The Age of Gods PBEM (Oct 4 2000)

### 4.1.1: Allowing stacking

By default, a unit may not stack with a noble belonging to another faction. A unit is also denied entry to a location controlled by another player if that location's border is closed.

Players may allow units from other factions to stack with them or enter buildings or ships they control with the `admit` order. (See also Control of Locations).