Adding augmentation dots
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To obtain dotted note lengths, simply add a dot (`.') to the number. Double-dotted notes are produced in a similar way.
\version "2.24.0"
%% http://lsr.di.unimi.it/LSR/Item?id=171
{
  a'4 b' c''4. b'8
  a'4. b'4.. c''8.
}