| Financial instruments | 
    This note provides information about the Group’s financial instruments, including:    
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 an overview of all financial instruments held by the Group;     |       
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 the classification of the financial instruments;     |       
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 the line item on the consolidated statement of financial position in which the financial instrument is included;     |       
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 the financial instrument’s book and fair value.     |       The Group holds the following financial instruments:     
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Non-current  other financial assets    | 
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12 | 
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18,887 | 
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  | 
695 | 
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—   | 
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19,582 | 
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19,582 | 
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 Current other financial assets    | 
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12 | 
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—   | 
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30,400 | 
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—   | 
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30,400 | 
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30,400 | 
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 Trade and other receivables    | 
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41,063 | 
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—   | 
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—   | 
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41,063 | 
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41,063 | 
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 Cash and cash equivalents    | 
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24,652 | 
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—   | 
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—   | 
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24,652 | 
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24,652 | 
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Non-current  other financial assets    | 
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12 | 
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61,861 | 
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2,754 | 
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41,984 | 
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64,615 | 
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64,615 | 
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 Current other financial assets    | 
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12 | 
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—   | 
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—   | 
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—   | 
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—   | 
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—   | 
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 Trade and other receivables    | 
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28,386 | 
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—   | 
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—   | 
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28,386 | 
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28,386 | 
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 Cash and cash equivalents    | 
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29,775 | 
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—   | 
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—   | 
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29,775 | 
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29,775 | 
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Due to the highly liquid nature of cash and cash equivalents and the pledged bank balance classified within  non-current  other financial assets, their carrying amount is considered to be the same as their fair value. Due to the short-term nature of trade and other receivables, their carrying amount is considered to be the same as their fair value.   
   
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14 | 
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213,128 | 
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—   | 
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213,128 | 
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271,370 | 
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Non-current  lease liabilities   | 
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26,097 | 
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—   | 
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26,097 | 
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N/A | 
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Current lease liabilities  | 
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5,520 | 
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—   | 
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5,520 | 
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N/A | 
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24,072 | 
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—   | 
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24,072 | 
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24,072 | 
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14 | 
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137,960 | 
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—   | 
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137,960 | 
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98,709 | 
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Non-current  lease liabilities   | 
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30,402 | 
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—   | 
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30,402 | 
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N/A | 
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Current lease liabilities  | 
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6,224 | 
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—   | 
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6,224 | 
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N/A | 
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41,280 | 
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—   | 
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41,280 | 
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41,280 | 
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15 | 
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—   | 
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6,713 | 
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6,713 | 
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6,713 | 
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Other financial liabilities  | 
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16 | 
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39,456 | 
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—   | 
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39,456 | 
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39,456 | 
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   Due to the short-term nature of the trade and other payables and other financial liabilities, their carrying amount is considered to be the same as their fair value.    
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28. Financial instruments    This note provides information about the Group’s financial instruments, including:    
   | 
•  | 
   | 
an overview of all financial instruments held by the Group;   | 
 
   
   | 
•  | 
   | 
the classification of the financial instruments;   | 
 
   
   | 
•  | 
   | 
the line item on the consolidated statement of financial position in which the financial instrument is included;   | 
 
   
   | 
•  | 
   | 
the financial instrument’s book and fair value.   | 
 
   The Group holds the following financial instruments:     
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    | 
  | 
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    | 
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  | 
 
Non-current  other financial assets   | 
   | 
  | 
18 | 
  | 
   | 
  | 
16,324 | 
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  | 
102 | 
  | 
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  | 
16,426 | 
  | 
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16,426 | 
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Trade and other receivables  | 
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19 | 
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  | 
24,366 | 
  | 
   | 
  | 
—   | 
  | 
   | 
  | 
24,366 | 
  | 
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  | 
24,366 | 
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Cash and cash equivalents  | 
   | 
  | 
21 | 
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  | 
8,274 | 
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—   | 
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8,274 | 
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8,274 | 
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  | 
   | 
  | 
  | 
  | 
 
Non-current  other financial assets   | 
   | 
  | 
18 | 
  | 
   | 
  | 
18,887 | 
  | 
   | 
  | 
695 | 
  | 
   | 
  | 
19,582 | 
  | 
   | 
  | 
19,582 | 
  | 
 
Current other financial assets  | 
   | 
  | 
18 | 
  | 
   | 
  | 
—   | 
  | 
   | 
  | 
30,400 | 
  | 
   | 
  | 
30,400 | 
  | 
   | 
  | 
30,400 | 
  | 
 
Trade and other receivables  | 
   | 
  | 
19 | 
  | 
   | 
  | 
41,063 | 
  | 
   | 
  | 
— | 
  | 
   | 
  | 
41,063 | 
  | 
   | 
  | 
41,063 | 
  | 
 
Cash and cash equivalents  | 
   | 
  | 
21 | 
  | 
   | 
  | 
24,652 | 
  | 
   | 
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— | 
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  | 
24,652 | 
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24,652 | 
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  | 
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   | 
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   | 
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   | 
 | 
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   | 
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 | 
 
  Due to the highly liquid nature of cash and cash equivalents and the pledged bank balance classified within  non-current  other financial assets, their carrying amount is considered to be the same as their fair value. Due to the short-term nature of trade and other receivables, their carrying amount is considered to be the same as their fair value.      
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24 | 
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  | 
159,610 | 
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159,610 | 
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257,075 | 
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Non-current  lease liabilities   | 
   | 
  | 
16 | 
  | 
   | 
  | 
12,077 | 
  | 
   | 
  | 
12,077 | 
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   | 
  | 
N/A | 
  | 
 
Current lease liabilities  | 
   | 
  | 
16 | 
  | 
   | 
  | 
1,826 | 
  | 
   | 
  | 
1,826 | 
  | 
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  | 
N/A | 
  | 
 
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  | 
26 | 
  | 
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  | 
12,627 | 
  | 
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12,627 | 
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12,627 | 
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   | 
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  | 
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   | 
  | 
24 | 
  | 
   | 
  | 
213,128 | 
  | 
   | 
  | 
213,128 | 
  | 
   | 
  | 
271,370 | 
  | 
 
Non-current  lease liabilities   | 
   | 
  | 
16 | 
  | 
   | 
  | 
26,097 | 
  | 
   | 
  | 
26,097 | 
  | 
   | 
  | 
N/A | 
  | 
 
Current lease liabilities  | 
   | 
  | 
16 | 
  | 
   | 
  | 
5,520 | 
  | 
   | 
  | 
5,520 | 
  | 
   | 
  | 
N/A | 
  | 
 
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  | 
26 | 
  | 
   | 
  | 
24,072 | 
  | 
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24,072 | 
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24,072  | 
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     Due to the short-term nature of the trade and other payables, their carrying amount is considered to be the same as their fair value.    
 |