\version "2.18.2"

\relative c'{

\time 2/4

\repeat unfold 2 {r16 fis g a bes a8 fis16} |
\alternative {
 {g16 fis g a bes a8 fis16} |
 {g16 fis g a bes a8 e16} |
}

\repeat unfold 3 {g16 fis g a bes a8 e16} |
}