Question:
Suicide bomber kills at least 4 in Kabul

What is a sentence that would be (on a scale from 0 to 5) a 2 out of 5 in terms of textual similarity to the above sentence?

Answer:
Suicide bomber kills 13 at restaurant in central Somalia

Question:
Romney to tap Ryan as vice presidential running mate

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

Answer:
Romney picks Ryan as vice presidential running mate: source

Question:
A black and white photo of a cow walking under a tree in a field.

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:
a black and white photo of a cow under a tree.