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|Twin Earth/TE: a particular word usage may be right in one situation and wrong in a different one, even if one cannot distinguish between the situations.
Twin Earth: the inhabitants do not need to be able to specify that they have different terms. They are not omniscient.
Visitors might use the terms inappropriately, the circumstances of the right non-inferential use of the German word for "water" requires that it is used as a response to H2O.
Order/Twin Earth/Brandom: it does not help to speak in concepts of what individuals can distinguish, because what they can react to depends on what reactions are considered to be different and the same problem occurs with regard to the vocabulary used - Problem: specifying vocabulary that fulfils two conditions: 1) The twins must be indistinguishable in different environments because of their description in that vocabulary (physical language is not enough for that) - 2) The sub-determination of the semantic properties of their states in this limited vocabulary must show something interesting.
Expressive Vernunft Frankfurt 2000
Begründen und Begreifen Frankfurt 2001