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}		}

/// Take the first n elements.		/// Take the first n elements.
DerivedT take_front(size_t n = 1) const {		DerivedT take_front(size_t n = 1) const {
return n < size() ? drop_back(size() - n)		return n < size() ? drop_back(size() - n)
: static_cast<const DerivedT &>(*this);		: static_cast<const DerivedT &>(*this);
}		}

		/// Take the last n elements.
		DerivedT take_back(size_t n = 1) const {
		return n < size() ? drop_front(size() - n)
		: static_cast<const DerivedT &>(*this);
		}

/// Allow conversion to SmallVector if necessary.		/// Allow conversion to SmallVector if necessary.
/// TODO(riverriddle) Remove this when SmallVector accepts different range		/// TODO(riverriddle) Remove this when SmallVector accepts different range
/// types in its constructor.		/// types in its constructor.
template <typename SVT, unsigned N> operator SmallVector<SVT, N>() const {		template <typename SVT, unsigned N> operator SmallVector<SVT, N>() const {
return {begin(), end()};		return {begin(), end()};
}		}

protected:		protected:
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[MLIR] Add `take_back()` to STLExtras.h for completeness.ClosedPublic