success = []

W.each do |w|

	# create temp arrays
	dict_arr = w.split('')
	user_arr = arr
	test = true

	# test whether users letters spell current word in dict
	while test
		dict_arr.each do |letter|
			if (user_arr.include?(letter))
				i = user_arr.index(letter)
				user_arr.delete_at(i)
			else
				test = false
				break
			end
		end
		if test
			success << w
			test = false
		end

	end


end

puts success.inspect
#=> ["hello", "world"] # should also include "well" but doesn't