Question: 2. Prove that the following code is correct, according to its specifica- tions. 1 def sort colours (A): 3 Pre: A is a list whose

2. Prove that the following code is correct, according to its

2. Prove that the following code is correct, according to its specifica- tions. 1 def sort colours (A): 3 Pre: A is a list whose elements are either red or blue Post: All red elements in A appear before all blue ones while i

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