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No, the initial element of the keys in a hashtable cannot be selected or modified after the key-value pair has been added to the hashtable. The initial element of a key is used in the hashing function to determine the bucket where the key-value pair will be stored, so changing it would result in the pair being stored in a different bucket and potentially cause collisions. It is important to choose the initial element of the key carefully to reduce the likelihood of collisions and ensure efficient access to the data in the hashtable.