def get_array_and_support_variables(abs_filepath, sheet, pivot_col):
    ar = read_array(abs_filepath, sheet)
    list_of_strings = ar[:,pivot_col]
    eq_dict = make_eq_dict(list_of_strings)    
    return ar, eq_dict    
def get_equations(file):
    list_of_strings = read_col(file, 'equations')
    # todo: 
    #     parse_to_formula_dict must:
    #        - control left side of equations
    return  list_of_strings, make_eq_dict(list_of_strings)