As there are words that can end or begin a sentence
(such as you: "You are ...", ".... you?"), ECTOR yields
short sentences (as "You?").
Some of them are too short.
It should be possible to alter the likelihood of short
phrases.
One way is to take into account the number of nodes
already in the sentence to decide whether or not the
current node is the end of the sentence (in isBeginning
or isEnding).
Beware: some short sentences could be salient: "Oh?"
"No.", etc.
