        GROUP BY b.concept_code_1, b.class_name, b.concept_id, b.concept_name, b.concept_class_id, b.i_combo,
                 ca.descendant_concept_id,pack_id
      )
-INSERT INTO сlass_to_rx_descendant
+INSERT INTO class_to_rx_descendant
 (class_code, class_name, concept_id, concept_name, concept_code, concept_class_id, "order")
 SELECT DISTINCT substring(concept_code_1, '\w+'),
                 class_name,

-- hardcoded combinations							   

-- 4.1
DROP TABLE IF EXISTS сlass_to_rx_descendant;
CREATE TABLE сlass_to_rx_descendant
AS
SELECT DISTINCT substring(concept_code_1, '\w+') AS class_code,
                class_name,

       JOIN concept c
            ON c.concept_id = descendant_concept_id AND c.vocabulary_id like 'RxNorm%' AND c.standard_concept = 'S'
       JOIN drug_strength d ON d.drug_concept_id = c.concept_id
WHERE descendant_concept_id NOT IN (SELECT concept_id FROM class_to_rx_descendant)
  AND NOT exists
  (SELECT 1
   FROM concept c2
