What is the type of interaction for the enzyme named 'ALA synthase' and the medicine named 'Aripiprazole'?
select t1.interaction_type from medicine_enzyme_interaction as t1 join medicine as t2 on t1.medicine_id = t2.id join enzyme as t3 on t1.enzyme_id = t3.id where t3.name = 'ALA synthase' and t2.name = 'Aripiprazole'