Input TRS:
    1: f(g(x),y,z) -> f(x,y,g(z))
   e1: f(x,y,g(z)) ->= f(x,g(y),z)	[relative]
   e2: f(x,a(),z) ->= f(x,g(a()),z)	[relative]
   e3: f(x,y,z) ->= f(x,y,g(z))	[relative]
Weak rule e2 calls a strict rule