best way to align words?

[bearophileHUGS at lycos.com]

> This is my first solution try, surely there are faster, shorter, better
> solutions...
> It creates a graph with the paths of words, then sorts the graph
> topologically,

Beside possible inefficiencies, this "solution" breaks if words aren't
in the correct order, the topological sort can't work...
I'll have to think about better solutions, if possible.

Sorry,
bye,
bearophile