create table ama(x int,y int);
insert into ama values(2,4);
insert into ama values(2,5);
insert into ama values(2,4);
insert into ama values(3,4);
insert into ama values(2,4);
insert into ama values(2,7);
insert into ama values(2,4);
insert into ama values(2,4);