\version "2.18.2"

makePercent =
#(define-music-function (parser location note) (ly:music?)
   "Make a percent repeat the same length as NOTE."
   (make-music 'PercentEvent
               'length (ly:music-length note)))
scoreACello = \relative c {
  \global
   \key f \minor
    \repeat percent4 {
   f8^>_\f  f16^. f16^.  f8^> f16^. f16^. f8^> f8^> %1
    }
  %{  
 \makePercent s2. %2
  \makePercent s2. %3
  \makePercent s2. %4
  %}
   \repeat percent 2 {
  f8^> f16^. f16^.  f8^> f16^. f16^. f8^> f8^> %5
   }
  %%%%%%%%%%  \makePercent s2. %6