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insert b(id)
select top 1 a1.id
from a a1,a a2
where a1.id<a2.id
and a1.sl + a2.sl = 8
order by a2.id
insert b(id)
select top 1 a2.id
from a a1,a a2
where a1.id<a2.id
and a1.sl + a2.sl = 8
order by a2.id