👉 In linguistics and computational linguistics, dissubstitution is a technique used in natural language processing to identify words that are not present or equivalent in a given context. It involves identifying all possible contexts where the word could be substituted for another word in a sentence, without changing the meaning of the sentence. Disubstitution can be applied to various types of sentences and phrases, such as declarative statements, interrogatives, and compound sentences. In a declarative statement, dissubstitution helps identify the