How do you re-print instrument names for certain systems?

[Speldosa]

I have a score that looks like this.

\score
{
        \new ChoirStaff
        <<
                \new Staff
                <<
                        \set Staff.instrumentName = #"Soprano"
                        \new Voice = "S"
                        \relative c'{
                        c1 | c1 | c1 | c1 | 
                        c1 | c1 | c1 | c1 | 
                        c1 | c1 | c1 | c1 | 
                        c1 | c1 | c1 | c1 |}
                        \new Lyrics \lyricsto "Soprano" { \sopranoWords }
                >>
                \new Staff
                <<
                        \set Staff.instrumentName = #"Alto"
                        \new Voice = "A"
                        \relative c'{
                        c1 | c1 | c1 | c1 | 
                        c1 | c1 | c1 | c1 | 
                        c1 | c1 | c1 | c1 | 
                        c1 | c1 | c1 | c1 |}
                        \new Lyrics \lyricsto "Alto" { \altoWords }
                >>
}

This results in a score where the words "Soprano" and "Alto" are printed
before the start of the two staffs for the first system. However, for
certain subsequent systems, I would like the instrument names to be
re-printed. How can I accomplish this?




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