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Input/Output Functions

(read [<stream> [<eof> [<rflag>]]])  READ AN EXPRESSION
    <stream>    the input stream (default is standard input)
    <eof>       the value to return on end of file (default is nil)
    <rflag>     recursive read flag (default is nil)
    returns     the expression read
(print <expr> [<stream>])  PRINT AN EXPRESSION ON A NEW LINE
    <expr>      the expression to be printed
    <stream>    the output stream (default is standard output)
    returns     the expression
(prin1 <expr> [<stream>])  PRINT AN EXPRESSION
    <expr>      the expression to be printed
    <stream>    the output stream (default is standard output)
    returns     the expression
(princ <expr> [<stream>])  PRINT AN EXPRESSION WITHOUT QUOTING
    <expr>      the expressions to be printed
    <stream>    the output stream (default is standard output)
    returns     the expression
(pprint <expr> [<stream>])  PRETTY PRINT AN EXPRESSION
    <expr>      the expressions to be printed
    <stream>    the output stream (default is standard output)
    returns     the expression
(terpri [<stream>])  TERMINATE THE CURRENT PRINT LINE
    <stream>    the output stream (default is standard output)
    returns     nil
(flatsize <expr>)  LENGTH OF PRINTED REPRESENTATION USING PRIN1
    <expr>      the expression
    returns     the length
(flatc <expr>)  LENGTH OF PRINTED REPRESENTATION USING PRINC
    <expr>      the expression
    returns     the length

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