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['A','B','C'],
['A','B','D']

A  A
B  B
C
   D

['A','B','C'],
['A','D','C'],
['A','B','C']

A       A       A
B       B
C       C
                D
                C

A       A       A
B       B
                D
C       C       C

#!/usr/bin/perl -w

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