On Tue, Nov 8, 2011 at 1:03 PM, André Müller <esperantist at gmail.com> wrote: > CVw' = 21x1 = 21 > CVy' = 21x4 = 84 I don't believe you're justified in calling {-Iw'}, {-ew'}, and {-Iy'} "impossible" just because you've never seen them. -- ghunchu'wI'