Table schema:
CREATE TABLE table_name_42 (cabinet VARCHAR, chair VARCHAR, year VARCHAR, fractievoorzitter VARCHAR)

Question: What is Cabinet, when Year is after 1981, when Fractievoorzitter is "Hans Van Mierlo", and when Chair is "W.I.J.M. Vrijhoef"?
SQL: SELECT cabinet FROM table_name_42 WHERE year > 1981 AND fractievoorzitter = "hans van mierlo" AND chair = "w.i.j.m. vrijhoef"