insert into down values ('a1','a3');

insert into down values ('a2','a5');
insert into down values ('a3','a7');

insert into down values ('a','a9');
insert into down values ('a5','a11');
insert into down values ('a6','a13');
insert into down values ('a7','a15');

insert into down values ('a8','a17');
insert into down values ('a9','a19');
insert into down values ('a10','a21');
insert into down values ('a11','a23');
insert into down values ('a12','a25');
insert into down values ('a13','a27');
insert into down values ('a14','a29');
insert into down values ('a15','a31');

insert into down values ('a16','a33');
insert into down values ('a17','a35');
insert into down values ('a18','a37');
insert into down values ('a19','a39');
insert into down values ('a20','a41');
insert into down values ('a21','a43');
insert into down values ('a22','a45');
insert into down values ('a23','a47');
insert into down values ('a24','a49');
insert into down values ('a25','a51');
insert into down values ('a26','a53');
insert into down values ('a27','a55');
insert into down values ('a28','a57');
insert into down values ('a29','a59');
insert into down values ('a30','a61');
insert into down values ('a31','a63');
