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\override Tie #'details #'ratio = #0.01
\override Tie #'details #'height-limit = #0  
\override Tie #'Y-offset = #-0.6  
\override Tie #'thickness = #4 

\tieDotted 
  a''2...~ \fermata  ^\markup { \box { "7''"  }} \hideNotes a''16 \unHideNotes \bar "'"  %1
  
  s16 <g'' fis'''>2...  \longfermata  ^\markup { \box { "13''" }} \bar "'" %1
  \tieDotted 
  des'1~   ^\markup { \box { " 7'' "  }}  \bar "'"  %1
  bes'1 \fermata  \bar "'"  %1
  s2. 
  s1
  bes''4 \verylongfermata  ^\markup { \box { "18''" }} \bar "'" %1
  s1
  \pitchedTrill
  c'''1 \startTrillSpan a''  ^\markup { \box { "5''" }}  \bar "'"  %1
  a''1 \stopTrillSpan \fermata  ^\markup { \box { "9''" }}  \bar "||"  %1
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