cython

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cdef class Base:
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    cpdef str noargs(self)
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    cpdef str int_arg(self, int i)
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    cpdef str _class(tp)
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cdef class Derived(Base):
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    cpdef str noargs(self)
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    cpdef str int_arg(self, int i)
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    cpdef str _class(tp)
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cdef class DerivedDerived(Derived):
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    cpdef str noargs(self)
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    cpdef str int_arg(self, int i)
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    cpdef str _class(tp)
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cdef class Derived2(Base):
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    cpdef str noargs(self)
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    cpdef str int_arg(self, int i)
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    cpdef str _class(tp)
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