These optional features can be incorporated in {HEAD ~ various embodiments} of {TAIL ~ the present invention} and are not all required; rather, any combination of them or any other information manipulation devices are within the scope of the present invention 
of
These optional features can be incorporated in { HEAD ~ various embodiments } of { TAIL ~ the present invention } and are not all required ; rather , any combination of them or any other information manipulation devices are within the scope of the present invention
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