def METHOD_NAME(fileBase, start, end):
	if start == 0 and end == 0:
		return
	url1 = buildUrl(URL1_FORMAT, fileBase, start, end)
	url2 = buildUrl(URL2_FORMAT, fileBase, start, end)
	print('curling %s' % url1)
	code1, data1 = getUrl(url1)
	print('curling %s' % url2)
	code2, data2 = getUrl(url2)
	if code1 != code2:
		if set([code1, code2]) == set([400, 500]):
			return
		print('Error: different codes %s %s' % (code1, code2))
		return
	if data1 != data2:
		print('Error: %s %s' % (url1, url2))