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from a cimport * cdef extern from "a/math.h": a_u16 a_u32_sqrt(a_u32 x) nogil a_u32 a_u64_sqrt(a_u64 x) nogil a_f32 a_f32_rsqrt(a_f32 x) nogil a_f64 a_f64_rsqrt(a_f64 x) nogil