Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Isambard Sinclair, narrator:  Is this the beginning of the end for Danger Mouse or only the end of the beginning ? Or is it three quarters plus a little tiny bit of somewhere around the middle ? Write your answers on a sliced loaf and tune in two the next enthralling installment of ' Four Heads Are Better than _ Two _ ' with Danger Mouse .

Heads