Ixion: could you please explain your Nr 19 to me? I was most impressed till I thought I discovered a flaw, that's why I didn't vote for it. Maybe I'm missing something.
On Ixion's No 19: no misunderstandings, I thought it was absolutely brilliant, too, but I think you'll find
the "a" is used twice in the wordplay (the order would be wrong, too, but that's not my point).