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I personalized the letters which , at the time , was much more difficult to do than it is to do today . This is something difficult to grasp at first . And it may become difficult to tell where an object ends and its background begins , making it difficult to see curbs or steps , for example . Please avoid putting files elsewhere on the laptop as this will make it more difficult to clean up . These simple results will undoubtedly be useful in practical situations when accurate numerical simulations are difficult to make and wind turbine site predictions are required .