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Configuration #44

RSST-R-0044-LEAN-VERIFIEDdischarging rule R4a

ring size 13

vertices 19 · edges 37

Free completion

edge 0–1edge 0–12edge 1–2edge 2–3edge 2–14edge 3–4edge 3–14edge 3–15edge 4–5edge 4–13edge 4–14edge 4–15edge 5–6edge 5–13edge 5–14edge 5–15edge 6–7edge 6–18edge 7–8edge 7–18edge 8–9edge 9–10edge 9–16edge 9–17edge 10–11edge 10–16edge 10–17edge 11–12edge 11–16edge 11–17edge 12–16edge 12–17edge 13–14edge 13–15edge 14–16edge 14–17edge 16–18vertex 0 · deg 2 · A·vermilion · ringvertex 1 · deg 2 · C·viridian · ringvertex 2 · deg 3 · B·ochre · ringvertex 3 · deg 4 · C·viridian · ringvertex 4 · deg 5 · B·ochre · ringvertex 5 · deg 5 · C·viridian · ringvertex 6 · deg 3 · A·vermilion · ringvertex 7 · deg 3 · B·ochre · ringvertex 8 · deg 2 · C·viridian · ringvertex 9 · deg 4 · A·vermilion · ringvertex 10 · deg 4 · C·viridian · ringvertex 11 · deg 4 · A·vermilion · ringvertex 12 · deg 4 · C·viridian · ringvertex 13 · deg 4 · D·indigovertex 14 · deg 7 · A·vermilionvertex 15 · deg 4 · A·vermilionvertex 16 · deg 6 · B·ochrevertex 17 · deg 5 · B·ochrevertex 18 · deg 3 · 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.