 Semantic computationalists reject FSC. They claim that mental computation is sometimes sensitive to semantic properties. Semantic computationalists can agree that drawing an inference involves executing a mechanical operation over structured symbols, and they can agree that the same mechanical operation uniformly applies to any premises with appropriate logical structure. So they can still explain inferential systematicity. However, they can also say that the postulated mechanical operation is sensitive to semantic properties. For example, they can say that conjunction elimination is sensitive to the meaning of Mentalese conjunction.