Question: For grants that have descriptions of Regular and Initial Applications, what are their start dates?
SQL: SELECT T1.grant_start_date FROM Grants AS T1 JOIN Documents AS T2 ON T1.grant_id  =  T2.grant_id JOIN Document_Types AS T3 ON T2.document_type_code  =  T3.document_type_code WHERE T3.document_description  =  'Regular' INTERSECT SELECT T1.grant_start_date FROM Grants AS T1 JOIN Documents AS T2 ON T1.grant_id  =  T2.grant_id JOIN Document_Types AS T3 ON T2.document_type_code  =  T3.document_type_code WHERE T3.document_description  =  'Initial Application'