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You can input the forumal as we do it in Excel, attached image for example.
[url=http://postimg.org/image/nl17kpe87/][img]http://s23.postimg.org/nl17kpe87/image.jpg[/img][/url]
[url=http://postimg.org/image/nl17kpe87/][img=http://s23.postimg.org/nl17kpe87/image.jpg][/url]