hallway/corridor count
The total count of hallways and cooridors in the built structure
{integer}
MIGS.ba.built.6.0; MIGS.eu.built.6.0; MIGS.vi.built.6.0; MIMAG.built.6.0; MIMARKS.specimen.built.6.0; MIMARKS.survey.built.6.0; MIMS.me.built.6.0; MISAG.built.6.0; MIUVIG.built.6.0