If Langton and Lewis's account reduces to duplication-preservation, it becomes explanatorily redundant given Lewis 1986a, which Langton and Lewis explicitly sought to improve upon.

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Account(as in 'Wittgenstein's account of concepts'): A philosophical explanation or theory about how something works or what something is.
Duplication-preservation(as a potential problem with the theory being critiqued): A technical concept suggesting that something is preserved (kept the same) when it's duplicated (copied exactly); this is a specific philosophical idea about what matters in certain situations.
Langton and Lewis(as philosophers cited for a specific theory): Rae Langton and David Lewis are contemporary philosophers who developed influential ideas about how to distinguish different types of properties (characteristics) of objects.
Lewis 1986a(as the previous theory that Langton and Lewis wanted to build upon): A famous philosophical work by David Lewis published in 1986 (the 'a' just marks which version or part of his published work that year); it's the earlier theory they were trying to improve.

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