Question:
Which employer did Alexander Aitken work for in Dec, 1920?

Context:
 Alexander Aitken works for Australian and New Zealand Army Corps from Jan, 1915 to Jan, 1917. 
 Alexander Aitken works for Otago Boys' High School from Jan, 1920 to Jan, 1923. 
 Alexander Aitken works for University of Edinburgh from Jan, 1925 to Jan, 1965.

Answer:
Question:
Which employer did Alexander Aitken work for in Dec, 1920?

Context:
 Alexander Aitken works for Australian and New Zealand Army Corps from Jan, 1915 to Jan, 1917. 
 Alexander Aitken works for Otago Boys' High School from Jan, 1920 to Jan, 1923. 
 Alexander Aitken works for University of Edinburgh from Jan, 1925 to Jan, 1965.

Answer:
user
Otago Boys' High School
assistant
Question:
Which employer did Alexander Aitken work for in Dec, 1920?

Context:
 Alexander Aitken works for Australian and New Zealand Army Corps from Jan, 1915 to Jan, 1917. 
 Alexander Aitken works for Otago Boys' High School from Jan, 1920 to Jan, 1923. 
 Alexander Aitken works for University of Edinburgh from Jan, 1925 to Jan, 1965.

Answer:
user
Australian and New Zealand Army Corps
University of Edinburgh
assistant
Question:
Which employer did Alexander Aitken work for in Dec, 1920?

Context:
 Alexander Aitken works for Australian and New Zealand Army Corps from Jan, 1915 to Jan, 1917. 
 Alexander Aitken works for Otago Boys' High School from Jan, 1920 to Jan, 1923. 
 Alexander Aitken works for University of Edinburgh from Jan, 1925 to Jan, 1965.

Answer:
user
Otago Boys' High School
assistant