Assertion: building | /r/HasAspect | three stairwells
Facets:
value: in the core
type: LOCATION
value: except on the mechanical floors
type: OTHER
Source sentences:
text: Each building had three stairwells, also in the core, except on the mechanical floors where the two outside stairwells temporarily left the core in order to avoid the express elevator machine rooms, and then rejoined the core by means of a transfer corridor.