text: -- tkt2192.test
  -- 
  -- execsql {
  --     SELECT x.a || '/' || x.b || '/' || y.b
  --       FROM v1 AS x JOIN v1 AS y ON x.a=y.a AND x.b<y.b
  --      ORDER BY x.a, x.b, y.b
  -- }
  SELECT x.a || '/' || x.b || '/' || y.b
  FROM v1 AS x JOIN v1 AS y ON x.a=y.a AND x.b<y.b
  ORDER BY x.a, x.b, y.b