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1. Golfing technique used Takashi Hayakawa

   "BEST OBFUSCATED ARTWORK" at 1993 Obfuscated PostScript Contest

   Deciphered from https://stuff.mit.edu/afs/sipb/contrib/postscript/obfuscated-1993/

   % "load def" pairs of names
   /a/add
   /s/sub
   /m/mul
   /d/div
   count 2 idiv { load def } repeat
   
   /decode {
       {
           ( ) dup 0 4 -1 roll put         % char to string
   
           dup (0) ge 1 index (9) le and { % is digit?
               cvi                         % char to int
           } {                             % is operator
               cvn                         % char to name
   
               dup where {                 % name known?
                   exch get exec           % exec mapped operator
               } {
                   pop                     % name unknown, ignore
               } ifelse
           } ifelse
       } forall
   } def
   
   (Test 1 2 a -> 3) =
   (1 2 a) decode =
   
   (Testing 3 4 m -> 12) =
   (3 4 m) decode =
   
   (Test 12a3m -> 9) =
   (12a3m) decode =
   
   (Test 23a4m -> 20) =
   (23a4m) decode =