CONJUNCTS : (thm -> thm list)
A |- t1 /\ t2 /\ ... /\ tn ----------------------------------- CONJUNCTS A |- t1 A |- t2 ... A |- tn
A |- (x /\ y) /\ z /\ w
[A |- x, A |- y, A |- z, A |- w] : thm list