On 5/7/06, van Nek <van.Nek at gmx.net> wrote: > > Am 7 May 2006 um 12:38 hat Robert Dodier geschrieben: > > op(<atom>); --> < identity function> So you are suggesting that op(x)=op(x[1])=op(x(1))? That sounds like an invitation to buggy code.... -s