"Wilk" <wilkSPAM at OUTflibuste.net> wrote in message news:87wu4gjkwb.fsf at blakie.riol... > Why not - instead of _ ? I believe some Lisps do use -. If so, they can do so because of the prefix and space-separator syntax: (- a-c c) is unambiguously a-c - c Terry J. Reedy