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Townhouses (or townhomes) are generally two- to three-story structures that share a wall with a neighbouring unit. As opposed to apartment buildings, townhouses do not have neighbouring units above or below them. They are similar in concept to row houses or terraced houses, but share a common design and construction.
A townhouse, townhome, town house, or town home, is a type of terraced housing. A modern townhouse is often one with a small footprint on multiple floors.
A shaft equipped with ladder rungs for personnel access. In civil engineering a shaft is an underground vertical or inclined passageway. Shafts are often entered through a manhole and closed by a manhole cover.
"Don't repeat yourself" (DRY), also known as "duplication is evil", is a principle of software development aimed at reducing repetition of information which is likely to change, replacing it with abstractions that are less likely to change, or using data normalization which avoids redundancy in the first place.