49         For alphabet and:        27 A
            /\         and weights as so:       15 B
          22  A                                  3 C
          /\                                     1 D
         7  B                                    1 E
        /\                                       1 F
       4  C                                      1 G
      /\
     2  2             Ordered so that the most frequent
    /\  /\            have the least 0's in their path
   D  EF  G

A=1   C=001   E=00001 G=00011
B=01  D=00000 F=00010