20 November 1979

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19 December 1979

20 December 1979

↓

17 January 1980

18 January 1980

↓

16 February 1980

17 February 1980

↓

16 March 1980

17 March 1980

↓

15 April 1980

16 April 1980

↓

14 May 1980

15 May 1980

↓

13 June 1980

14 June 1980

↓

12 July 1980

13 July 1980

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11 August 1980

12 August 1980

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9 September 1980

10 September 1980

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9 October 1980

10 October 1980

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7 November 1980