How to sell anything

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Kuvan lähde http://image-store.slidesharecdn.com/d3cc805b-42fb-44c2-a64d-b69f01429d85-original.jpeg (8.12.2016).
http://notes.fundersandfounders.com/post/79265485612/how-to-sell-anything (8.12.2016)

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