▼	Set of symbols
▼	Propositional connective
▼	Set of propositional connectives
▼	Complete set of propositional connectives
▼	Set of propositional symbols
▼	Set of predicate symbols
▼	Set-theoretic alphabet
▼	Set-theoretic language
▼	Set-theoretic expression
▼	Set-theoretic formula
▼	Class term

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