One card might let you jump to the directly adjacent tile, another may allow you to shift three tiles clockwise and yet another could let you investigate the houses on your left and right. (wolfsgamingblog.com)
Houses and apartments score points, while factories and economic buildings can affect the score of adjacent tiles. (tomsguide.com)
The point is that the labels can be realised by making notches in the edges of one tile and adding protruding lugs to match them in the adjacent tile. (newscientist.com)