|      |(3:cdef%efgab$)|leaf
     |(1:ab)|
     |      |(13:$)|leaf
tree:|
     |     |(3:cdef%efgab$)|leaf
     |(2:b)|
     |     |(13:$)|leaf
     |
     |(3:cdef%efgab$)|leaf
     |
     |(4:def%efgab$)|leaf
     |
     |      |(7:%efgab$)|leaf
     |(5:ef)|
     |      |(10:gab$)|leaf
     |
     |     |(7:%efgab$)|leaf
     |(6:f)|
     |     |(10:gab$)|leaf
     |
     |(7:%efgab$)|leaf
     |
     |(10:gab$)|leaf
     |