Context: The Polish scholar Jan Baudouin de Courtenay (together with his former student Mikołaj Kruszewski) introduced the concept of the phoneme in 1876, and his work, though often unacknowledged, is considered to be the starting point of modern phonology. He also worked on the theory of phonetic alternations (what is now called allophony and morphophonology), and had a significant influence on the work of Ferdinand de Saussure.

Question: When was the phoneme as a concept introduced?
Answer: 1876

Question: Who was Jan Baudouin de Courtenay's student?
Answer: Mikołaj Kruszewski

Question: What nationality was de Courtenay?
Answer: Polish

Question: What was de Courtenay's profession?
Answer: scholar

Question: Who was influenced by  Jan Baudouin de Courtenay?
Answer: Ferdinand de Saussure

Question: When was allophony as a concept introduced?
Answer: Unanswerable

Question: Who was Jan Baudouin de Courtenay's father?
Answer: Unanswerable

Question: What nationality was Kruszewski?
Answer: Unanswerable

Question: What was Kruszewski's profession?
Answer: Unanswerable

Question: Who was influenced by Mikolaj Kruszewski?
Answer: Unanswerable