SQL> WITH RECURSIVE x(a) as(select 1 from rdb$database union all select a+1 from x where a c AS (
CON> SELECT a id,POWER(2,a-1) b,CEIL(a/5.0) r,MOD(a-1,5) c FROM x
CON> )
CON> ,m AS (
CON> SELECT c1.id id1,c2.id id2,c1.b b1,c2.b b2
CON> ...
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