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http://appinventor.mit.edu/
is in list?
If thing is one of the elements of the list, returns true; otherwise, returns false. Note that if a list contains sublists,
the members of the sublists are not themselves members of the list. For example, the members of the list (1 2 (3 4)) are 1, 2, and the list (3 4); 3 and 4 are not themselves members of the list.
http://appinventor.mit.edu/
index in list
Returns the position of the thing in the list. If not in the list, returns 0.
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