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 26.3 Conditional Evaluation of a Sequence of Expressions
 ========================================================
 
 `and' and `or' evaluate all their arguments, similar to `begin', but
 evaluation stops as soon as one of the expressions evaluates to false
 or true, respectively.
 
  -- syntax: and expr ...
      Evaluate the EXPRs from left to right and stop evaluation as soon
      as one expression evaluates to `#f'; the remaining expressions are
      not evaluated.  The value of the last evaluated expression is
      returned.  If no expression evaluates to `#f', the value of the
      last expression is returned.
 
      If used without expressions, `#t' is returned.
 
  -- syntax: or expr ...
      Evaluate the EXPRs from left to right and stop evaluation as soon
      as one expression evaluates to a true value (that is, a value
      different from `#f'); the remaining expressions are not evaluated.
      The value of the last evaluated expression is returned.  If all
      expressions evaluate to `#f', `#f' is returned.
 
      If used without expressions, `#f' is returned.
 

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