using PowerShell Compare row with next row in CSV : how to compare the line with next line and delete the duplicate.
a.	if the record before is different. (i.e. the column B change)
b.	and if the other of the record before changes (i.e. the column C change)
either a or b condition happen the line will be keep , if the line and next line are same will be delete.  its not checking for duplicate , is every line compare with next line.

for example original CSV

COLUMN A                                                      COLUMN B                                                     COLUMN C                                                    
--------                                                      --------                                                     --------                                                    
A                                                             A1                                                           1                                                           
B                                                             A1                                                           2                                                           
C                                                             A1                                                           1                                                           
D                                                             B1                                                           3                                                           
E                                                             B1                                                           3                                           
B                                                             B1                                                           1  

Expected result will be :

COLUMN A                                                      COLUMN B                                                     COLUMN C                                                    
--------                                                      --------                                                     --------                                                    
A                                                             A1                                                           1                                                           
B                                                             A1                                                           2                                                           
C                                                             A1                                                           1                                                           
D                                                             B1                                                           3                                                           
B                                                             B1                                                           1 
                                                 