Ciro Santilli @cirosantilli 40

There are two toplevel boxes, one contains only input, and all output goes to the second one. The second one may also contain some input.

A point is a 1-square.

A dotted path that is also a dotted line.

Distance = 0.

There are two or more boxes drawn inside the toplevel and sharing boundaries with toplevel.

A path is something you obtain by somehow drawing from one point to another, e.g. a line, and then starting another drawing between two points from the end point.