SQL query (general)

i have the following table R
id a1 a2
1 A B
2 A B
3 B C
4 C A
5 B C

and to write q uery thats outputs the following
id a1 a2
1 A B
2 A B
3 B C
5 B C

Is the following query correct?
select *
from (select *
from R
groupby a1) as T1,
(select *
from R
groupby a1) as T2,
where T1.id<>T2.id
AND T1.a1=T2.a1
AND T1.a2=T2.a2;

please correct.