Theorem anllr ≪ | index | src | ≫ 

theorem anllr (a b c d: wff): $ a /\ b /\ c /\ d -> b $;
StepHypRefExpression
1 anr 
a /\ b -> b
2 1 anwll 
a /\ b /\ c /\ d -> b

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)