static L<S> withLeadingSquareBracketStuffNotContaining(fS s, L<S> l) { ret [S x : unnull(l) | !cic(leadingSquareBracketStuff(x), s)]; } static L<S> withLeadingSquareBracketStuffNotContaining(L<S> l, fS s) { ret withLeadingSquareBracketStuffNotContaining(s, l); }