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my $sth = $dbh->prepare('SELECT word FROM ? WHERE word = ?');
foreach my $x (@checklists) {
...
    my $ret = $sth->fetchrow_hashref();
    ...etc...
}

DBD::mysql::st execute failed: You have an error in your SQL syntax ne
+ar ''common_dict' WHERE word = 'aa'' at line 1 at ./quiddler.pl line 
+48.
DBD::mysql::st fetchrow_hashref failed: fetch() without execute() at .
+/quiddler.pl line 49.
Issuing rollback() for database handle being DESTROY'd without explici
+t disconnect().