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27 spaces, 26 blue lines, and one red line.
A cubic graph must have an even number of vertices. Then, a Hamilton cycle (visiting all vertices) must have an even number of vertices and also an even number of edges. Alternatively color this edges red and blue, and the remaining edges green.
In the Union Jack, the flag of the United Kingdom, there are no parallel lines. The flag consists of diagonal and perpendicular lines intersecting to form a complex pattern of crosses representing the individual countries of the UK. The red diagonal cross of St. Patrick is superimposed over the diagonal white cross of St. Andrew, which is then superimposed over the vertical and horizontal red cross of St. George.
yeah they have a bunch of blue and red lines of thread; the pattern is so confusing only the certified machines can do it, therefore, yes.