int n1, int n2,
                           double *in, double *out,
                           fftw_r2r_kind kind0,
                           fftw_r2r_kind kind1,
                           fftw_r2r_kind kind2,
                           unsigned flags);
fftw_plan fftw_plan_r2r(int rank, const int *n, double *in, double *out,
                        const fftw_r2r_kind *kind, unsigned flags);
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