>
> > AFAIK, only a "satem" language would develop a sibilant
> > from a former affricate,
>
> PIE *TsT > PGmc. *ss
>
I meant an *uncondicioned* development. It's a pity nobody here has
considered my proposal that Hittite hart(ag)ga- mightn't be the reflex
of a "thorny cluster".