Question: Python 7.10 There seems to be some redundancy in the repertoire of the positional list ADT, as the operation L.add first(e) could be enacted by

Python

7.10

There seems to be some redundancy in the repertoire of the positional list ADT, as the operation L.add first(e) could be enacted by the alternative L.add before(L.first(), e). Likewise, L.add last(e) might be per- formed as L.add after(L.last(), e). Explain why the methods add first and add last are necessary.

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