A 2-measure chromatic fugue subject with a recognizable 3-note component is presented both rectus and inversus, some softer interludes on the Hinterwerk over an organ point provide welcome relief from the sternness. On the last page, the three notes are used in both eighths and quarters, which I tried to emphasize, and then Brahms makes use of them in staccato with an extra eight rest, with the rest of the fugue subject in dotted quarters again interrupted by quarter rests.