Ja zuster, nee zuster
Dutch people today, especially those who remember the original series, are very disappointed that, apart from one programme, the whole series has been lost.  This is because it was recorded on Ampex tape which was very expensive so, after the episodes had been shown on television, other television programmes were recorded on the same tape over the top of it.  Some of the film that was shot outside has been preserved.  15 of the songs from the series have also been preserved.  They were made into a gramophone record (LP) and later into a CD.