Dot tutorial (or how to create a tree graphic in Linux)

$ sudo apt-get install graphviz 

save in file.dot:

digraph trie {
root[label="root"]
0[label="0"]
1[label="1"]
10[label="10"]
11[label="11"]

root->0[label="root->0"]
root->1[label="root->1"]
1->10[label="1->0"]
1->11[label="1->1"]
}

$ dot file.dot -Tpng -o file.png

output: