\version "2.22.1"
\language "english"

staffUp = \change Staff = "upper"

voiceFive = #(context-spec-music (make-voice-props-set 4) 'Voice)
voiceSix = #(context-spec-music (make-voice-props-set 5) 'Voice)

globalNoFour = {
  \time 3/4
  \key ef \minor
}

rightHandUpperNoFour = {
  bf8 ef df4^> cf8 bf |
  af8 f4. s4 |
}

rightHandLowerNoFour = {
  gf4 g2 |
  s2. | 
}

rightHandNoFour = \relative c'' {
  \globalNoFour
  << { \rightHandUpperNoFour } \\ { \rightHandLowerNoFour } >>
}

leftHandUpperNoFour = {
  <<
    \new Voice { 
      \voiceThree 
      ef2 ef4~ |
      ef4 d( \staffUp ef^>) |
    }
    \new Voice {
      \voiceSix 
      bf2. * 2/3 ef8 df |
      % Below is my solution to the problem.  Is it readable?
      \voiceFive 
      cf8 af s2 | 
    }
  >>
}

leftHandLowerNoFour = {
  ef4 ef2~ |
  ef2. |
}

leftHandNoFour = \relative c' {
  \globalNoFour
  \clef bass
  << { \leftHandUpperNoFour } \\ { \leftHandLowerNoFour } >>
}

\score {
  \new PianoStaff <<
    \new Staff = "upper" \rightHandNoFour
    \new Staff = "lower" \leftHandNoFour
  >>
}