|- !A. STAR A = {s | RESTRICT s A = s}
|- !A. [] IN STAR A
|- !x A. [x] IN STAR A = x IN A
|- !a t A. CONS a t IN STAR A = a IN A /\ t IN STAR A
|- !s t A. APPEND s t IN STAR A = s IN STAR A /\ t IN STAR A
|- !A. STAR A = {t | (t = []) \/ HD t IN A /\ TL t IN STAR A}
|- !A B. A SUBSET B ==> STAR A SUBSET STAR B