used reference in the specification to u201c one embodiment u201d or to u201c an embodiment u201d means that a particular feature structure or characteristic described in connection with the embodiments is included in at least one embodiment of the invention the appearances of the phrase u201c in one embodiment u201d in various places in the specification are not necessarily all referring to the same embodiment some portions of the detailed description that follows are presented in terms of algorithms and symbolic representations of operations on data bits within a computer memory these algorithmic descriptions and representations are the means used by those skilled in the data processing arts to most effectively convey the substance of their work to others skilled in the art an algorithm is here and generally conceived to be a self consistent sequence of steps instructions leading to a desired result the steps are those requiring physical manipulations of physical quantities usually though not necessarily these quantities take the form of electrical magnetic or optical signals capable of being stored transferred combined compared and otherwise manipulated it is convenient at times principally for reasons of common usage to refer to these signals as bits values elements symbols characters terms numbers or the like furthermore it is also convenient at times to.