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Table 3 The hierarchical spatial relationships between blocks and counties and between blocks and congressional districts

From: U.S. congressional district cancer death rates

County Block Congressional district
County A Block A1  
  Block A2  
  Block A3  
   Congressional district #1
  ...  
County B Block B1  
  Block B2  
  Block B3  
  ...  
County C Block C1 Congressional district #2
  Block C2  
  Block C3  
  ...  
... ... ...