Clearly, we are expected to believe that the tories are the most right-leaning section of this trio - even allowing for their massive, leftward surge under 'Dave'.
The Lib Dems are objectively the most liberal left of these three.
The coalition seems to be going rather too well at the moment.
Add all these ingredients together then analyse carefully! What must you conclude?
The correct answer is that if you check back to the opening sentence of this piece, the evidence is stacking up and beginning to look rather conclusive!