Reconstruction talk:Proto-Slavic/-ьstvo

Hello. Does this come from rebracketing/metanalysis of words such as, from + ? --Per utramque cavernam 14:26, 13 May 2018 (UTC)
 * Hello. Meillet compares this suffix with 🇨🇬. Possibly -s- was just inserted. Compare -pt-/-bt- > -t-, but in many Slavic languages verbs were reformed to -pst-/-bst-.—Игорь Тълкачь (talk) 07:29, 14 May 2018 (UTC)