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def whereis(s1,s2):    '''whereis(str, str) - > int/boolean        Returns the index number of the first occurence of the single letter     string s2 in the string s1. Returns False if the parameters given are not     strings and if s2 is not a single letter in length.'''    if ( type(s1) != str ) or ( type(s2) != str ):        return False        if len(s2) != 1:        return False        return s1.find(s2)def reverse(original_list):    '''reverse(list) - > list/boolean        Given a list, returns a new list in which the elements of the original    list have been reversed. Returns False if the parameter given is not a list.     '''        if ( type(original_list) != list ) :        return False    new_list = []    for element in list:        new_list.insert(0,element)    return new_list