Rank the conformers of butane in order of decreasing stability,putting the most stable first. 
Definitions:
Proposition Not-p
A proposition that negates another proposition, symbolically represented as ¬p.
Contraries
Statements, ideas, or actions that are opposed to each other; in logic, two propositions are contraries if they cannot both be true but can both be false.
Negated
Made ineffective or invalidated; in logic, a proposition that denies or contradicts another proposition.
Raining
The process of precipitation in the form of water droplets falling from clouds in the atmosphere to the ground.
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