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problem:

lispify:  can't parse 'iras', because "ras" is also a root, and 
          it's longer than "ir"

          Must associate probabilities to roots, so that we can wisely
          parse words 


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p136,  compound words:
      must add:    "preposition as prefix"
                   libr -o- sankt -o 
                      can have -o- in between 


