Removing time signature and bar lines

Engravers can be removed one by one. Here, the time signature and bar lines have been removed.

\version "2.24"

%% http://lsr.di.unimi.it/LSR/Item?id=123

%LSR modified by P.P.Schneider on Feb.2014

\score {
  \new Staff \relative c'' {
    a4 b c d
    d4 c b a
  }
  \layout {
    ragged-right = ##t
    \context {
      \Staff
      \omit TimeSignature
       % or:
      %\remove "Time_signature_engraver"
      \omit BarLine
      % or:
      %\remove "Bar_engraver"
    }
  }
}