string = ababc%bc$

     |      |(3:abc%bc$)|leaf
     |(1:ab)|
     |      |(5:c%bc$)|leaf
tree:|
     |     |(3:abc%bc$)|leaf
     |(2:b)|
     |     |     |(6:%bc$)|leaf
     |     |(5:c)|
     |     |     |(9:$)|leaf
     |
     |     |(6:%bc$)|leaf
     |(5:c)|
     |     |(9:$)|leaf
     |
     |(6:%bc$)|leaf
     |
     |(9:$)|leaf