Sign language ; Sign language (pragm.) ; Gebärdensprache (pragm.) ; Conversational analysis (sign language) ; LIBRAS; Língua brasileira de sinais; LSKB; Língua de sinais dos índios Urubus-Kaapor brasileiros; Brazilian Sign Language ; Erstspracherwerb; First language acquisition; Ontogenese; Language acquisition ; Child language (conversational analysis) ; Kindersprache (pragm.) ; Conversational analysis (child language)