In some case, after cloning a program, we may want the user to enter a few informations and, based on this, compute something more complex, such as Google "add to calendar link" (https://www.google.com/calendar/render?action=TEMPLATE&text=Your+Event+Name&dates=20140127T224000Z/2...)
So it may make a lot of sense to have a new type of tokens on programs : formulas.
-Greg
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