problem([]==>a:u(1)=>b:u(1)=>c:u(1)=>d:u(1)=> ((a=>b=>c)=>d)=> ((a#b)=>c)=>d,
repeat dequantify_once,lambda(a,lambda(b,lambda(c,lambda(d,_8763)))),
[problem([a:u(1),b:u(1),c:u(1),d:u(1)]==> ((a=>b=>c)=>d)=> ((a#b)=>c)=>d,
 propositional,lambda(v0,lambda(v1,su(v2,[v0 of lambda(v2,lambda(v3,su(su(v5,[v1 of (v2&v3)],[v5]),[v0 of lambda(v4,su(lambda(v6,v5),[v1 of (v2&v3)],[v5]))],[v4])))],[v2]))),
 [
 ]) ext _8763
]).
