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"/home/user/sym_dir/_2013 'http://www.downloadsite.com/.dat'"

use strict;
use wanings;

$ perl -Mstrict -Mwarnings -le '
    my $wget_url = "/some/path/_SYMBOL__2013 http://example.com/_SYMBO
+L_.dat";
...
/some/path/A_2013 http://example.com/A.dat
/some/path/B_2013 http://example.com/B.dat
/some/path/C_2013 http://example.com/C.dat