% === BEGIN ps-print prologue 3

% --- duplex feature verification
1
UseSetpagedevice {
  {<< /Duplex DuplexValue /Tumble TumbleValue >> setpagedevice}
}{
  {statusdict begin
    DuplexValue setduplexmode TumbleValue settumble
   end}
}ifelse
CheckConfig

% === END ps-print prologue 3