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Configuration #60

RSST-R-0060-COMP-1976discharging rule R4a

ring size 11

vertices 15 · edges 26

Free completion

edge 0–1edge 0–10edge 0–11edge 1–2edge 1–11edge 2–3edge 3–4edge 4–5edge 5–6edge 6–7edge 6–13edge 7–8edge 7–12edge 7–13edge 7–14edge 8–9edge 8–12edge 8–13edge 8–14edge 9–10edge 9–12edge 9–14edge 10–14edge 11–12edge 11–13edge 11–14vertex 0 · deg 3 · C·viridian · ringvertex 1 · deg 3 · B·ochre · ringvertex 2 · deg 2 · A·vermilion · ringvertex 3 · deg 2 · B·ochre · ringvertex 4 · deg 2 · A·vermilion · ringvertex 5 · deg 2 · C·viridian · ringvertex 6 · deg 3 · B·ochre · ringvertex 7 · deg 5 · A·vermilion · ringvertex 8 · deg 5 · B·ochre · ringvertex 9 · deg 4 · A·vermilion · ringvertex 10 · deg 3 · B·ochre · ringvertex 11 · deg 5 · A·vermilionvertex 12 · deg 4 · C·viridianvertex 13 · deg 4 · C·viridianvertex 14 · deg 5 · C·viridian
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.