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Configuration #63

RSST-R-0063-COQ-2005discharging rule R6

ring size 14

vertices 17 · edges 25

Free completion

edge 0–1edge 0–13edge 0–16edge 1–2edge 1–15edge 1–16edge 2–3edge 2–15edge 2–16edge 3–4edge 3–15edge 4–5edge 5–6edge 6–7edge 7–8edge 8–9edge 9–10edge 10–11edge 11–12edge 11–14edge 12–13edge 12–14edge 13–16edge 14–15edge 15–16vertex 0 · deg 3 · A·vermilion · ringvertex 1 · deg 4 · C·viridian · ringvertex 2 · deg 4 · D·indigo · ringvertex 3 · deg 3 · B·ochre · ringvertex 4 · deg 2 · A·vermilion · ringvertex 5 · deg 2 · B·ochre · ringvertex 6 · deg 2 · A·vermilion · ringvertex 7 · deg 2 · B·ochre · ringvertex 8 · deg 2 · A·vermilion · ringvertex 9 · deg 2 · B·ochre · ringvertex 10 · deg 2 · A·vermilion · ringvertex 11 · deg 3 · B·ochre · ringvertex 12 · deg 3 · A·vermilion · ringvertex 13 · deg 3 · C·viridian · ringvertex 14 · deg 3 · C·viridianvertex 15 · deg 5 · A·vermilionvertex 16 · deg 5 · 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.