    Sentence 1: What is‘ one ‘example of an  “instance . that’ the quantitative answer to  the ‘traveling salesman Problem, fails :to  answer? .    Sentence 2: To further highlight the:  difference :between a problem and ‘an  instance, consider the following instance of  the’ decision - version”of- ‘the’ traveling  . slesinat roblem: Is. pis @ toute of. at  ost 2000 holométres cert shoigh 0 all   of Germany's 15 sin cities ¢ .         