w(1,7,11,14,18, 21)
	w(1,7,11,14, 3)	#21 - 18 becomes new product, toss onto the end
	# 14 > 3, ignore it, continue
	w(1,7,11, 3)
	# 11 > 3, ignore it, continue
	w(1,7, 3)
	# 7 > 3, ignore it, continue
	w(1, 3)
	# 1 <= 3, subtract from 3, continue
	w(2)	#pop off our sum (2), and our test digit. Oops!
			#No test digit, die with a bang, we failed.
#hops all the way back up to here, throws away 18, and continues.
#it has determined there is no subset that contains 18 and adds to 21.
w(1,7,11,14, 21)
	w(1,7,11, 7)	#21 - 14 becomes new product, toss onto the end
	# 11 > 7, ignore it, continue
	w(1,7, 7)
	# 7 <= 7, subtract it from 7, continue
		w(1, 0) #pops off the sum, which is 0 in this case, so we've succeeded. "die" with no bang -> success!