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+Mariyam Phyu Hi there - try this other video I made to help with that  https://www.youtube.com/watch?v=ABo401sXz9s   p.s. could you spare 30 secs to vote for me here - would mean a lot.  Thanks Mr H :-) http://www.virginmediabusiness.co.uk/pitch-to-rich/start-up/hegartymaths/