german pangram with precomposed ligatures

From HTML sampler, attributed to Karl Pentzlin.  Covers many digraphs and
trigraphs, some of which have been replaced by presentational forms if
available in Unicode.  This is mostly a technical test of code points,
not of proper typesetting: proper ligatures should be determined by fonts
and rarely matches only these 6 sets.

Common Fraktur ligatures: ch ck ff ffi ffl fft fi fl ft ll ſch ſi ſſ ſt tz;
replaced by single glyphs for:  ff  ffi   ffl       fi  fl                  ſt.
Usage of long s precludes inclusion of U+FB06 st, but this is already present
elsewhere.