I've recently gotten into collecting Tenchi Muyo! 
cels, and I think I've seen exactly one which 
came with a matching sketch.  A lot of Tenchi 
cels seem to come with a (often stuck) unmatching 
sketch, or else no sketch at all.  Were the cels 
all seperated from thei sketches before leaving 
the studio?  Are there a whole batch of cel-less 
sketches floating around out there?  What's the 
story behind all these orphened cels?