quetion about slur in the "<< .... \\ .....>>"

[mosea chen]

Hi,

    I found it difficult to engrave the staff as the fingure:

the "slur" just does not work.

The source is as follows:

\version "2.19.80"

{

    \clef bass

    \time 3/4

    

    fis-2 ( e-1 d-2 |

    <<

        { r4 ) e4 a8 ( g8  | }

        \\

        { a,2. |  }

    >>

    fis4 ) r4 r4

}