десять - двадцать
двадцать - десять

тридцать - десять
десять - тридцать

declare @t table (id int, txt varchar(500))
insert @t values (10, 'десять'), (20,'двадцать'), (30,'тридцать'), (40,'сорок')
select * from @t

;with t as (
  select
  t1.id [i1], t1.txt [u1],
  t2.id [i2], t2.txt [u2],
  case when t1.id > t2.id then t1.id else t2.id end [c1],
  case when t1.id < t2.id then t1.id else t2.id end [c2] 
  from @t t1
  cross join @t t2
  where t1.id <> t2.id
)
select top 1 with ties
*
from t
order by row_number() over(partition by c1, c2 order by (select 0))