def convert_condensed(voters):
    """
    This functions gets a list of voters and convert in each voter preferences
    in condensed string form.

    Example:
    list_of_voters = [["a","b","c","d"],["b","a","c","d"]]

    convert_condensed(list_of_voters)
    ## Output: ['abcd', 'bacd']
    """
    return ["".join(voter) for voter in voters]