Question: Let E : { 0 , 1 } k times { 0 , 1 } m 7 - > { 0 , 1 }

Let E : {0,1}k \times {0,1}m 7->{0,1}m be a blockcipher known to be a secure PRF.
Prove that the function family F2 : {0,1}k \times {0,1}2m 7->{0,1}m specified for all
x1, x2 in {0,1}m and all K in {0,1}k below is not a secure PRF:

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