drop table if exists con, aux, nul, lpt1, com1, `clock$`;
create table con (a int);
drop table con;
create table aux (a int);
drop table aux;
create table nul (a int);
drop table nul;
create table lpt1 (a int);
drop table lpt1;
create table com1 (a int);
drop table com1;
create table `clock$` (a int);
drop table `clock$`;