Question:
Iran nuclear talks start in Geneva

What is a sentence that would be (on a scale from 0 to 5) a 3 out of 5 in terms of textual similarity to the above sentence?

Answer:
Iran nuke talks begin amid hopes of progress

Question:
Obama, Romney prepare to debate

What is a sentence that would be (on a scale from 0 to 5) a 4 out of 5 in terms of textual similarity to the above sentence?

Answer:
Obama, Romney Prepare for First Debate

Question:
Report of two explosions at finish line of Boston Marathon

What is a sentence that would be (on a scale from 0 to 5) a 3 out of 5 in terms of textual similarity to the above sentence?

Answer:
Witnesses hear 'loud booms' at Boston Marathon