how to filter out rests from articulations

[Stefan Thomas]

Dear community,
in the below quoted snippet, I would like to have the rests in the second staff without articulations.
Is it possible?

\version "2.12.2"
arti = { 
  \repeat "unfold" 4 { s8-.-> s-. }
}
fragA = \relative c' {
  \context Voice << {c8 d e f g a b c } { \arti }>>
}
fragB = \relative c'' {
  \context Voice << {r8 b r g r e r c} {\arti }>>
   }
   
   \score { 
   << \new Staff \fragA
     \new Staff \fragB >>
   }