class Range
	def coerce(n)
		case caller[0].match(/`(.*)'/)[1]
		when "-"
			[self.class.new(-last, -first, exclude_end?), -n]
		else
			[self, n]
		end
	end
 
	def +(n); first+n..last+n end
	def -(n); first-n..last-n end
	def *(n); (first*n..last*n).step(n) end
end
 
module Enumerable
	def squared
		map{ |x| x**2 }
	end
 
	def sum
		inject(0,&:+)
	end
end
 
p (6 + (1..12)).squared.sum
p (6 - (1..12)).squared.sum
p (6 * (1..12)).squared.sum
p ((1..12) + 6).squared.sum
p 6 - (1..12)
p (1..12) - 6
p ((1..12) - 6).squared.sum
p ((1..12) * 6).squared.sum
p ((1..12).squared * 36).sum

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