$1.$ In this problem, X $=$ A $||$ B $||$ C means that the string X can be written as A $||$ B $||$ C such that $|$B$|=|$A$|+|$C$|$ and $|$A$|=|$C$|.$ Define the compression function h : $\{0,1\}256\{0,1\}128$ such that h$($X$)=$ AESB$($A $||$ C$),$ where X $=$ A $||$ B $||$ C$.$ Show that h is not CR by clearly describing a collision