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I need to solve a system of non-linear fourth-order differential equations. Is there a command which solves this system? Thanks in advance.

I am using the function permutations from the package *gregmisc*. However, I am also making use of the package *e1071*, which also contains a function called permutations. I want to use the function permutations from the * gregmisc* package, however, the other package is masking this function. This happens both when I load the *e1071* package before *gregmisc* and when I load *e1071* after I load