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Literal constants may be written by using an external representation of the data. In general, the external representation must be quoted (see Quoting); but some external representations can be used without quotation.
"abc" ⇒ "abc" 145932 ⇒ 145932 #t ⇒ #t #\a ⇒ #\a
The external representation of numeric constants, string constants, character constants, and boolean constants evaluate to the constants themselves. Symbols, pairs, lists, and vectors require quoting.