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  1.  
  2.  
  3.           cindex string indexExpr
  4.                Returns  the  character  indexed  by   the   expression
  5.                indexExpr (zero based) from string.
  6.  
  7.                If the expression indexExpr starts with the string end,
  8.                then end is replaced with the index of the last charac-
  9.                ter in the string.  If the expression starts with  len,
  10.                then len is replaced with the length of the string.
  11.