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With its cross-platform files and formatting preservation , it 's easy to understand why PDF is so popular . At-risk kids are children who shoulder so many problems , it 's easy to understand why so many want to escape . And it 's easy to understand why they believe in themselves and in their homelands . Without the warming effect of the Gulf Stream , it is easy to understand why Europe would quickly get cold like North America . It 's easy to understand why the transition can be so difficult .