STL List members
·back(), returning the last element of the list.
·clear(),
·begin(), returning the first element of the list.
·empty(),
·size(),
·swap(argument), swaps two lists.
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·elements may be erased:
·erase() and clear() both erase all elements,
·erase(pos) erases all elements starting at position pos,
·erase(begin, end) erases elements indicated by the iterator range [begin, end).
·elements may be inserted at a certain position pos:
·insert(pos, source) inserts source at pos,
·insert(pos, begin, end) inserts the elements in the iterator range [begin, end).
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