Lambda Calculus - Reductions #4

Reduce the following expression, using the beta-rule, to no more than one term. If the expression cannot be reduced, enter "CAN'T REDUCE".

(λg.((λf.((λx.(f (x x)))(λx.(f (x x))))) g)) 

Your answer should look like:

u

(This is not the actual answer, just a demonstration of how you should present it.)