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// Yes the nomenclature is a bit illogical static Chain chainPlus(Chain chain, A a) { ret Chain(a, chain); } static ReverseChain chainPlus(ReverseChain chain, A a) { ret ReverseChain(chain, a); } ifclass AppendableChain static AppendableChain chainPlus(AppendableChain chain, A a) { ret chain == null ? new AppendableChain(a) : chain.add(a); } endif