% Mizar problem: t39_enumset1,enumset1,607,5 
fof(t39_enumset1, conjecture,  (! [A] :  (! [B] :  (! [C] :  (! [D] : k4_enumset1(A, A, A, B, C, D)=k2_enumset1(A, B, C, D)) ) ) ) ).
fof(dt_k2_enumset1, axiom, $true).
fof(dt_k3_enumset1, axiom, $true).
fof(dt_k4_enumset1, axiom, $true).
fof(t32_enumset1, axiom,  (! [A] :  (! [B] :  (! [C] :  (! [D] : k3_enumset1(A, A, B, C, D)=k2_enumset1(A, B, C, D)) ) ) ) ).
fof(t33_enumset1, axiom,  (! [A] :  (! [B] :  (! [C] :  (! [D] :  (! [E] : k4_enumset1(A, A, B, C, D, E)=k3_enumset1(A, B, C, D, E)) ) ) ) ) ).
