sentence1: W follows the (useful) practice of listing a shortened pronunciation key on each right-hand page; L 's failure to do so is a disadvantage, notwithstanding the simplicity of their system, for the user must ferret about to find the description given on page xxii to clarify any question.
sentence2: Using L's work, while their system is generally easy to use, one must turn to page xxii to find a pronunciation guide, while W lists such a guide on every right-hand page and false is not true .