Input TRS:
    1: or(true(),y) -> true()
    2: or(x,true()) -> true()
    3: or(false(),false()) -> false()
    4: mem(x,nil()) -> false()
    5: mem(x,set(y)) -> =(x,y)
    6: mem(x,union(y,z)) -> or(mem(x,y),mem(x,z))
Number of strict rules: 6
Direct Order(PosReal,>,Poly) ... failed.
Freezing ... failed.
Dependency Pairs:
   #1: #mem(x,union(y,z)) -> #or(mem(x,y),mem(x,z))
   #2: #mem(x,union(y,z)) -> #mem(x,y)
   #3: #mem(x,union(y,z)) -> #mem(x,z)
Number of SCCs: 1, DPs: 2, edges: 4
	SCC { #2 #3 }
Removing DPs: Order(PosReal,>,Sum)... succeeded.
   mem(x1,x2)	weight: 0
 false()	weight: 0
 #mem(x1,x2)	weight: x2
  true()	weight: 0
     =(x1,x2)	weight: 0
 union(x1,x2)	weight: (/ 1 2) + x1 + x2
   nil()	weight: 0
    or(x1,x2)	weight: 0
   set(x1)	weight: 0
  #or(x1,x2)	weight: 0
    Usable rules: { }
    Removed DPs: #2 #3
Number of SCCs: 0, DPs: 0, edges: 0
YES