Tsk.*Challenge*
Span (BH in #180) was used in #111 (also by BH ).
Last valid word is Spate, Trev & Rob in nib.
*Challenge*Splayed
Quite right. I think my brain is broken.*Challenge*
You've can't add letters in the middle. And you wrote the flippin' rules...
If you ignore my Splayed post Rob's Slayed is in fact valid and Trev didn't say which word Payer was descended from, so it wasn't clear if that was valid or not. As we have a run now we'll continue from Payer with Prayer, Sprayer, Strayers and Strayed. Trev and prpr in nib.Trev's "payer" is valid as far as I can tell.