Question:
Who was the head of Berlin in Feb, 1981?

Context:
 Otto Suhr is the head of the government of Berlin from Jan, 1955 to Aug, 1957. 
 Franziska Giffey is the head of the government of Berlin from Dec, 2021 to Dec, 2022. 
 Heinrich Albertz is the head of the government of Berlin from Dec, 1966 to Oct, 1967. 
 Klaus Wowereit is the head of the government of Berlin from Jun, 2001 to Dec, 2014. 
 Michael Müller is the head of the government of Berlin from Dec, 2014 to Dec, 2021. 
 Walter Momper is the head of the government of Berlin from Mar, 1989 to Jan, 1991. 
 Dietrich Stobbe is the head of the government of Berlin from May, 1977 to Jan, 1981. 
 Franz Amrehn is the head of the government of Berlin from Aug, 1957 to Oct, 1957. 
 Ernst Reuter is the head of the government of Berlin from Dec, 1948 to Oct, 1953. 
 Eberhard Diepgen is the head of the government of Berlin from Jan, 1991 to Jun, 2001. 
 Klaus Schütz is the head of the government of Berlin from Oct, 1967 to May, 1977. 
 Hans-Jochen Vogel is the head of the government of Berlin from Jan, 1981 to Jun, 1981. 
 Willy Brandt is the head of the government of Berlin from Oct, 1957 to Dec, 1966. 
 Walther Schreiber is the head of the government of Berlin from Oct, 1953 to Jan, 1955. 
 Richard von Weizsäcker is the head of the government of Berlin from Jun, 1981 to Feb, 1984.

Answer:
Question:
Who was the head of Berlin in Feb, 1981?

Context:
 Otto Suhr is the head of the government of Berlin from Jan, 1955 to Aug, 1957. 
 Franziska Giffey is the head of the government of Berlin from Dec, 2021 to Dec, 2022. 
 Heinrich Albertz is the head of the government of Berlin from Dec, 1966 to Oct, 1967. 
 Klaus Wowereit is the head of the government of Berlin from Jun, 2001 to Dec, 2014. 
 Michael Müller is the head of the government of Berlin from Dec, 2014 to Dec, 2021. 
 Walter Momper is the head of the government of Berlin from Mar, 1989 to Jan, 1991. 
 Dietrich Stobbe is the head of the government of Berlin from May, 1977 to Jan, 1981. 
 Franz Amrehn is the head of the government of Berlin from Aug, 1957 to Oct, 1957. 
 Ernst Reuter is the head of the government of Berlin from Dec, 1948 to Oct, 1953. 
 Eberhard Diepgen is the head of the government of Berlin from Jan, 1991 to Jun, 2001. 
 Klaus Schütz is the head of the government of Berlin from Oct, 1967 to May, 1977. 
 Hans-Jochen Vogel is the head of the government of Berlin from Jan, 1981 to Jun, 1981. 
 Willy Brandt is the head of the government of Berlin from Oct, 1957 to Dec, 1966. 
 Walther Schreiber is the head of the government of Berlin from Oct, 1953 to Jan, 1955. 
 Richard von Weizsäcker is the head of the government of Berlin from Jun, 1981 to Feb, 1984.

Answer:
user
Hans-Jochen Vogel
assistant
Question:
Who was the head of Berlin in Feb, 1981?

Context:
 Otto Suhr is the head of the government of Berlin from Jan, 1955 to Aug, 1957. 
 Franziska Giffey is the head of the government of Berlin from Dec, 2021 to Dec, 2022. 
 Heinrich Albertz is the head of the government of Berlin from Dec, 1966 to Oct, 1967. 
 Klaus Wowereit is the head of the government of Berlin from Jun, 2001 to Dec, 2014. 
 Michael Müller is the head of the government of Berlin from Dec, 2014 to Dec, 2021. 
 Walter Momper is the head of the government of Berlin from Mar, 1989 to Jan, 1991. 
 Dietrich Stobbe is the head of the government of Berlin from May, 1977 to Jan, 1981. 
 Franz Amrehn is the head of the government of Berlin from Aug, 1957 to Oct, 1957. 
 Ernst Reuter is the head of the government of Berlin from Dec, 1948 to Oct, 1953. 
 Eberhard Diepgen is the head of the government of Berlin from Jan, 1991 to Jun, 2001. 
 Klaus Schütz is the head of the government of Berlin from Oct, 1967 to May, 1977. 
 Hans-Jochen Vogel is the head of the government of Berlin from Jan, 1981 to Jun, 1981. 
 Willy Brandt is the head of the government of Berlin from Oct, 1957 to Dec, 1966. 
 Walther Schreiber is the head of the government of Berlin from Oct, 1953 to Jan, 1955. 
 Richard von Weizsäcker is the head of the government of Berlin from Jun, 1981 to Feb, 1984.

Answer:
user
Eberhard Diepgen
Otto Suhr
Klaus Schütz
Richard von Weizsäcker
Franz Amrehn
Willy Brandt
Walter Momper
Franziska Giffey
Klaus Wowereit
Michael Müller
Ernst Reuter
Walther Schreiber
Dietrich Stobbe
Heinrich Albertz
assistant
Question:
Who was the head of Berlin in Feb, 1981?

Context:
 Otto Suhr is the head of the government of Berlin from Jan, 1955 to Aug, 1957. 
 Franziska Giffey is the head of the government of Berlin from Dec, 2021 to Dec, 2022. 
 Heinrich Albertz is the head of the government of Berlin from Dec, 1966 to Oct, 1967. 
 Klaus Wowereit is the head of the government of Berlin from Jun, 2001 to Dec, 2014. 
 Michael Müller is the head of the government of Berlin from Dec, 2014 to Dec, 2021. 
 Walter Momper is the head of the government of Berlin from Mar, 1989 to Jan, 1991. 
 Dietrich Stobbe is the head of the government of Berlin from May, 1977 to Jan, 1981. 
 Franz Amrehn is the head of the government of Berlin from Aug, 1957 to Oct, 1957. 
 Ernst Reuter is the head of the government of Berlin from Dec, 1948 to Oct, 1953. 
 Eberhard Diepgen is the head of the government of Berlin from Jan, 1991 to Jun, 2001. 
 Klaus Schütz is the head of the government of Berlin from Oct, 1967 to May, 1977. 
 Hans-Jochen Vogel is the head of the government of Berlin from Jan, 1981 to Jun, 1981. 
 Willy Brandt is the head of the government of Berlin from Oct, 1957 to Dec, 1966. 
 Walther Schreiber is the head of the government of Berlin from Oct, 1953 to Jan, 1955. 
 Richard von Weizsäcker is the head of the government of Berlin from Jun, 1981 to Feb, 1984.

Answer:
user
Hans-Jochen Vogel
assistant