I keep forgetting which complex lines are considered to conflict with each other, so I put together this quick-reference guide in hopes that a visual presentation would help it to sink in.
The edges of field divisions and ordinaries may use any of these complex line styles, with a few exceptions.
Plain lines predominate, but the other styles whose names are underlined are also fairly common in period.
Groups of lines separated by a dotted border are considered to be sufficiently different to have a DC.
Available as a PDF file or as a high-resolution PNG.