George C. Privon 1cae464232 exercise 4.2: error dependence on x and on dt %!s(int64=2) %!d(string=hai) anos
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ex4.1.hs be0190da3f exercise 4.1: add header %!s(int64=2) %!d(string=hai) anos
ex4.2.hs 1cae464232 exercise 4.2: error dependence on x and on dt %!s(int64=2) %!d(string=hai) anos