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1 2 3 4 5 6 7 | R4RS 6.10.3 (write-char char) ==> unspecific
(write-char char output-port) ==> unspecific
Writes the character CHAR (not an external representation of the
character) to the given port and returns an unspecified value. The
OUTPUT-PORT argument may be omitted, in which case it defaults to
the value returned by CURRENT-OUTPUT-PORT.
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