how to implement the snippet in the attachment

[Jinsong Zhao]

hi there,

I am trying to transcribe a music sheet.  I have encountered the snippet in the attachment.  I don't figure out a way to implement it.  I am now using an alternative way like:

\version "2.19.83"

\relative c'' {

\key f \major

<<{bes2 ~ bes8 g a4} \\

{r4 <f d> ~ <f d>8 [<d bes>] <e c>4} >>

}

However,  I hope to get the same output like the attachment.  any suggestion?  thanks in advance. 

best, 

Jinsong

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