De Bruijn sequences contain all sequences of a given length from a given alphabet. The integers corresponding to the indices of characters in their alphabet cover the range 0 to . These integers are arranged on a half circle, and the Euler cycle visiting all edges of the graph is shown by arcs. The blue arcs connect lower to higher integers and the red arcs connect higher to lower integers. Tooltips for points show the enumerated integers. Tooltips for arcs give the connections between lists of digits as rules.