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Lack of response on our part to subsequent polemics by Rudolf should not be interpreted as aquiescence , but rather as a refusal to play the game of the battle of attrition . The impatient reader who knows German will likely be able to find all the errors for him - or herself , and should progress directly from his response to the text of the Wetzel-Lohse letter itself , which he has failed - for very good reason - to quote at length . " Vergasungsapparate " discussed in the text are delousing chambers . Furthermore , its root word " Apparatur " ( equipment ) is not the same as " Apparat " ( device ) - perhaps Crowell did not notice this . We should not waste our time finding documents on stamp-collecting or the State Labor Service or other mundane activities that happen to contain some variation on the one word " device . " US soldiers on peacekeeping duties in the future could find that a portable translation device will be an essential part of their equipment . He developed the toture device that became known as " The Boger Swing . The Einsatzgruppen performed their murderous work in broad daylight and in the presence of the local population ; only when the Germans began their retreat was an effort made to erase the traces of their crimes . They create programs that enable computers to play video games - - such as Age of Kings , a strategy game - - by themselves . The system works by having a speech recogniser that picks up the words in Croatian , turns the speech into text . Prof. Vrba 's book ( I Cannot Forgive ) unfortunately lacks an index , but he does refer to Wetzler throughout.the text .