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public c v1 · immutable...2.6.18 -> 2.6.19-rcX -> 2.6.19 -> 2.6.20-rcX -> 2.6.20 -> 2.6.21-rcX -> 2.6.21 -> 2.6.22-rcX -> 2.6.22.y... =>> mainline |\__ 2.6.18.y \__ 2.6.19.y \__ 2.6.20.y \__ 2.6.21.y |\__ 2.6.22.y =>> stable fork \__ 2.6.18-Y debian fork | \__ 2.6.22.y-op =>> en fork \__2.6.22-y ubuntu fork =>> ubuntu fork