10  Pascal User Manual  Here are the special symbols:  Alternative special symbols:  Word symbols  (or reserved words) are normally underlined in the  hand-written program to emphasize their interpretation as single sym­ bols with fixed meaning. You may not use these words in a context other  than that explicit in the definition of Pascal: in particular, these words  may not be used as identifiers. They are written as a sequence of upper­ case or lower--case letters (without surrounding escape characters).  Here are the word-symbols:  and  array  begin  case  const  div  do  downto  else  end  file  for  function  goto  if  in  label  mod  nil  not  of  or  packed  procedure  program  record  repeat  set  then  to  type  until  var  while  with  (.  for  [  .)  for]  @  or  A  for  i  +  *  /  <>  <  <=  >  >=  :=  i  Identifiers  are names denoting constants, types, bounds, variables, pro­ cedures, and functions. They must begin with a letter, which may be fol­ lowed by any combination and number of letters and digits. The spell­ ing of an identifier is significant over its whole length. Corresponding  upper--case and lower--case letters are considered equivalent.  I.C.  Identifiers 