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Configuration #13

RSST-R-0013-COQ-2005discharging rule R4b

ring size 9

vertices 12 · edges 19

Free completion

edge 0–1edge 0–8edge 0–11edge 1–2edge 1–11edge 2–3edge 3–4edge 4–5edge 4–10edge 5–6edge 5–9edge 5–10edge 6–7edge 6–9edge 6–10edge 7–8edge 7–10edge 9–10edge 10–11vertex 0 · deg 3 · A·vermilion · ringvertex 1 · deg 3 · C·viridian · ringvertex 2 · deg 2 · A·vermilion · ringvertex 3 · deg 2 · B·ochre · ringvertex 4 · deg 3 · C·viridian · ringvertex 5 · deg 4 · B·ochre · ringvertex 6 · deg 4 · C·viridian · ringvertex 7 · deg 3 · B·ochre · ringvertex 8 · deg 2 · C·viridian · ringvertex 9 · deg 3 · D·indigovertex 10 · deg 6 · A·vermilionvertex 11 · deg 3 · B·ochre
100%

Outer cycle (bold ring) is the configuration's boundary; interior vertices form the reducible piece. A configuration is D-reducible when every 4-coloring of its ring either extends to the interior or can be Kempe-modified into one that does.