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A bug in the layout caused co-linear chains to be inverted. The existing code tried to point the direction away from the centre of the molecule, valid when the chain is kinked but not when co-linear. Here we now just return the vector. An artefact of this folding back on it's self caused a problem with the rendering make an SVG file that was 1.4 light years tall :-).
The huge SVG: here.