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$DB_BTREE->{'flags'} = R_DUP ;
$x = tie %dictf, "DB_File", "f.db", O_RDWR|O_CREAT, 0666, $DB_BTREE
...
$status == 0 ;
$status = $x->seq($key, $value, R_NEXT) )
{ print "$key -> $value\n"; }

0

> ls -lh *.db
-rw-r--r-- 1 xxxxx xxx 4.2G Dec  3 14:03 f.db