Skip branches in walking subtree

[fgregg]

    printf (
        "Now the trie structure is supposed to be:\n"
        "\n"
        "          +---o-> (3) -o-> (4) -l-> [5]\n"
        "          |\n"
        "          |        +---i-> (7) -z-> (8) -e-> [9]\n"
        "          |        |\n"
        "(1) -p-> (2) -r-> (6) -e-> (10) -v-> (11) -i-> (12) -e-> (13) -w-> [14]\n"
        "                   |         |\n"
        "                   |         +---p-> (15) -a-> (16) -r-> (17) -e-> [18]\n"
        "                   |\n"
        "                   +---o-> (19) -d-> (20) -u-> (21) -c-> (22) -e-> [23]\n"
        "                             |\n"
        "                             +---g-> (24) -r-> (25) -e-> (26) -s-> (27) -s-> [28]\n"
        "\n"
);

If we iterated through this using the current code, we would get

> while it.next():
>   print(it.key())
'pool'
'prize'
'preview'
'prepare'
'produce'
'progress'

Once I get to the pre prefix, I'd like to skip the branches in the and skip to the next big branch. This is the output I want

'pool'
'prize'
'preview'  (this probably needs to be here because I have to go into that branch to realize I don't want to keep going)
'produce'
'progress'

Is there a way to be at node 6