Count the number of credit cards that the customer with first name Blanche and last name Huels has.
select count(*) from customers_cards as t1 join customers as t2 on t1.customer_id = t2.customer_id where t2.customer_first_name = "Blanche" and t2.customer_last_name = "Huels" and t1.card_type_code = "Credit"