Never send farmer left to right empty-handed

There's never a reason for the farmer to go across the river (from left
to right) empty handed: there's no point unless he's bringing something
over. Coming back is another story: she has to come back empty handed to
leave room in the boat for more stuff.
Change $< and $> to left and right

Once we've parsed the tokens there's no sense in keeping obscure
ascii art artifacts around. Illiteration FTW! (ugh, need sleep).