Octadecagon and 2{9/4} or two enneagrams, {18/6} is reduced to 6{3} or 6 equilateral triangles, and finally {18/9} is reduced to 9{2} as nine digons. Deeper truncations of the regular enneagon and enneagrams can produce isogonal (vertex-transitive) intermediate octadecagram forms with equally spaced vertices and two edge lengths. Other truncations form double coverings: t{9/8}={18/8}=2{9/4}, t{9/4}={18/4}=2{9/2}, t{9/2}={18/2}=2{9}. The regular octadecagon is the Petrie polygon for a number of higher-dimensional polytopes, shown in these skew orthogonal projections from Coxeter planes: Octadecagon An octadecagon (or octakaidecagon) or 18-gon is an eighteen-sided polygon. A "regular octadecagon" has a Schläfli symbol {18} and can be constructed
How Long, How Long Blues How Long, How Long Blues "How Long, How Long Blues" (also known as "How Long Blues" or "How Long How Long") is a blues song recorded by the American blues duo Leroy Carr and Scrapper Blackwell in 1928. The song became "an instant best-seller" and one of the first blues standards, inspiring many blues songs of the era. It has been recorded by many artists, not only in blues but also country and western, pop, and jazz. "How Long, How Long Blues" is based on "How Long Daddy", recorded in 1925 by Ida Cox with Papa Charlie Jackson. Leroy Carr