List of Contextual Sentences

They are in the API now, due to a recent change. They are subject to Terms and Conditions, though.

If you have Open Framework installed, you can get a list via the javascript console.
There are 10,800 sentences.

var context_sentences;
	context_sentences = [].concat.apply([],items.filter(i=>i.object=='vocabulary').map(i=>

That puts all of them in a variable called context_sentences. What you do with them after that depends on the format you want them in for easy manipulation.