Question:
Who was the head of Aachen in Dec, 1948?

Context:
 Hermann Heusch is the head of the government of Aachen from Jan, 1952 to Jan, 1973. 
 Jürgen Linden is the head of the government of Aachen from Oct, 1989 to Oct, 2009. 
 Marcel Philipp is the head of the government of Aachen from Oct, 2009 to Nov, 2020. 
 Kurt Malangré is the head of the government of Aachen from Jan, 1973 to Oct, 1989. 
 Albert Maas is the head of the government of Aachen from Jan, 1946 to Jan, 1952. 
 Sibylle Keupen is the head of the government of Aachen from Nov, 2020 to Dec, 2022.

Answer:
Question:
Who was the head of Aachen in Dec, 1948?

Context:
 Hermann Heusch is the head of the government of Aachen from Jan, 1952 to Jan, 1973. 
 Jürgen Linden is the head of the government of Aachen from Oct, 1989 to Oct, 2009. 
 Marcel Philipp is the head of the government of Aachen from Oct, 2009 to Nov, 2020. 
 Kurt Malangré is the head of the government of Aachen from Jan, 1973 to Oct, 1989. 
 Albert Maas is the head of the government of Aachen from Jan, 1946 to Jan, 1952. 
 Sibylle Keupen is the head of the government of Aachen from Nov, 2020 to Dec, 2022.

Answer:
user
Albert Maas
assistant
Question:
Who was the head of Aachen in Dec, 1948?

Context:
 Hermann Heusch is the head of the government of Aachen from Jan, 1952 to Jan, 1973. 
 Jürgen Linden is the head of the government of Aachen from Oct, 1989 to Oct, 2009. 
 Marcel Philipp is the head of the government of Aachen from Oct, 2009 to Nov, 2020. 
 Kurt Malangré is the head of the government of Aachen from Jan, 1973 to Oct, 1989. 
 Albert Maas is the head of the government of Aachen from Jan, 1946 to Jan, 1952. 
 Sibylle Keupen is the head of the government of Aachen from Nov, 2020 to Dec, 2022.

Answer:
user
Sibylle Keupen
Jürgen Linden
Marcel Philipp
Kurt Malangré
Hermann Heusch
assistant
Question:
Who was the head of Aachen in Dec, 1948?

Context:
 Hermann Heusch is the head of the government of Aachen from Jan, 1952 to Jan, 1973. 
 Jürgen Linden is the head of the government of Aachen from Oct, 1989 to Oct, 2009. 
 Marcel Philipp is the head of the government of Aachen from Oct, 2009 to Nov, 2020. 
 Kurt Malangré is the head of the government of Aachen from Jan, 1973 to Oct, 1989. 
 Albert Maas is the head of the government of Aachen from Jan, 1946 to Jan, 1952. 
 Sibylle Keupen is the head of the government of Aachen from Nov, 2020 to Dec, 2022.

Answer:
user
Albert Maas
assistant