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Configuration #20

RSST-R-0020-COMP-1976discharging rule R4a

ring size 7

vertices 11 · edges 25

Free completion

edge 0–1edge 0–6edge 0–7edge 0–8edge 1–2edge 1–7edge 1–8edge 1–9edge 1–10edge 2–3edge 2–9edge 2–10edge 3–4edge 3–9edge 3–10edge 4–5edge 4–10edge 5–6edge 5–7edge 5–8edge 6–7edge 6–8edge 7–8edge 7–10edge 8–9vertex 0 · deg 4 · D·indigo · ringvertex 1 · deg 6 · A·vermilion · ringvertex 2 · deg 4 · B·ochre · ringvertex 3 · deg 4 · A·vermilion · ringvertex 4 · deg 3 · B·ochre · ringvertex 5 · deg 4 · D·indigo · ringvertex 6 · deg 4 · A·vermilion · ringvertex 7 · deg 6 · B·ochrevertex 8 · deg 6 · C·viridianvertex 9 · deg 4 · D·indigovertex 10 · 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.