How to join notes in markup?

[Fan Hongtao]

Hi, all

I want to write some words with music notes. I can write single note, but don't know how to join them. 

\version "2.18.2"

{

  \clef bass

  c8[ c]

}

\markup {

  % How to join the following two notes?

  \note-by-number #3 #0 #UP

  \note-by-number #3 #0 #UP

}

--

Best Wishes,
Fan Hongtao
----------------------------------------------------
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http://fanhongtao.github.io/