Two StaffGroup's in a singe line?

[Joerg Peter]

Dear all,

when writing

\new StaffGroup {
  <<
  \new Staff { \relative c'' { f4 d e c \bar "|."} }
  \new Staff { \relative c'  { c2 c4 f \bar "|." } } 
  >>
  }
\new StaffGroup {
  <<
  \new Staff { \relative c' { f2. d4 | } }
  \new Staff { \relative c' { f2 b4 g | } }
  >>
  }

each StaffGroup will be starting a new line.

Is it possible to engrave the second StaffGroup to the right of the
first one without a line break (posibly with some gap (s2))?