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A line with a mark in the middle represents a transition with a passage guard. It can only be opened after visiting both locations connected by the transition. Several lines represent a multi-transition (several transitions, each of which can be one of three types: 0 - normal with a guard, wide, and border guard).
If everything is clear with a normal passage, then the question is: what is a Wide passage and a Border guard??? I can't figure out the conditional designations of the templates.