95
Define
Zone A
Zone A lies directly next to the outside world, so enter 'Zone A' as name and select 'Outside World' as parent node.
Zone B
Zone B lies directly next to the outside world, so enter 'Zone B' as name and select 'Outside World' as parent node.
Zone I
Zone I lies directly next to Zone A, so enter 'Zone I' as name and select 'Zone A' as parent node.
Zone K
Zone K lies directly next to Zone A, so enter 'Zone K' as name and select 'Zone A' as parent node.