Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
C:\Users\x\Desktop>try.pl
 A. Header & sequences are:
>gi1 cds
ATG
>gi2 cds
ATG
>gi3 cds
GGG
 B. Only sequences are:
ATG
GGG
C.  Non-redundant sequences are: (This is wrong) 
>gi1 cds
ATG
>gi2 cds
ATG
>gi3 cds
GGG