INSTRUCTIONS

The figures of this preprint can be obtained as postscript files with
a request, via computer mail, to one of the authors.


 The text between the lines BODY and ENDBODY is made  of


   816 lines   and       33248 bytes



 In the following table this count is broken down by ASCII  code;
 immediately following the code is the corresponding  character.

     20270  lowercase letters
       747  uppercase letters
       703  digits
       114  ASCII characters   9
       816  ASCII characters  10

      4667  ASCII characters  32
       662  ASCII characters  36 $
        85  ASCII characters  38 &
        73  ASCII characters  39 '
       260  ASCII characters  40 (
       261  ASCII characters  41 )
        20  ASCII characters  42 *
        57  ASCII characters  43 +
       350  ASCII characters  44 ,
       107  ASCII characters  45 -
       254  ASCII characters  46 .
        48  ASCII characters  47 /
        54  ASCII characters  58 :
        17  ASCII characters  59 ;
         6  ASCII characters  60 <
       133  ASCII characters  61 =
         2  ASCII characters  62 >
         3  ASCII characters  63 ?
         4  ASCII characters  64 @
        61  ASCII characters  91 [
      1173  ASCII characters  92 \
        59  ASCII characters  93 ]
        68  ASCII characters  94 ^
       297  ASCII characters  95 _
        31  ASCII characters  96 `
       908  ASCII characters 123 {
        19  ASCII characters 124 |
       905  ASCII characters 125 }
        14  ASCII characters 126 ~

 BODY