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        Is Col 1 Data In Col 2 and vice versa  In Excel, you can compare the cells in two ranges with an array formula.         Consider this table  - look at columns 1 and 4 - note the occurrence of the values  
          
            | Value | Is A in D | (BlankCell)  | Value | Is D in A |  
            | 1 | Yes |  | 0 | No |  
            | 2 | Yes |  | 1 | Yes |  
            | 3 | No |  | 2 | Yes |  
            | 4 | No |  | 6 | No |  
            | 5 | No |  | 7 | No |  The table is obtained by :  
          
            | Value | Is A in D | (BlankCell)  | Value | Is D in A |  
            | 1 | 
  | =IF(ISNA(VLOOKUP(A2,$D$2:$D$6,1,FALSE)),"No","Yes") |  |  | 0 | 
  | =IF(ISNA(VLOOKUP(D2,$A$2:$A$6,1,FALSE)),"No","Yes") |  |  
            | 2 | 
  | =IF(ISNA(VLOOKUP(A3,$D$2:$D$6,1,FALSE)),"No","Yes") |  |  | 1 | 
  | =IF(ISNA(VLOOKUP(D3,$A$2:$A$6,1,FALSE)),"No","Yes") |  |  
            | 3 | 
  | =IF(ISNA(VLOOKUP(A4,$D$2:$D$6,1,FALSE)),"No","Yes") |  |  | 2 | 
  | =IF(ISNA(VLOOKUP(D4,$A$2:$A$6,1,FALSE)),"No","Yes") |  |  
            | 4 | 
  | =IF(ISNA(VLOOKUP(A5,$D$2:$D$6,1,FALSE)),"No","Yes") |  |  | 6 | 
  | =IF(ISNA(VLOOKUP(D5,$A$2:$A$6,1,FALSE)),"No","Yes") |  |  
            | 5 | 
  | =IF(ISNA(VLOOKUP(A6,$D$2:$D$6,1,FALSE)),"No","Yes") |  |  | 7 | 
  | =IF(ISNA(VLOOKUP(D6,$A$2:$A$6,1,FALSE)),"No","Yes") |  |        |