The pattern alternates between + and , with the group lengths increasing by 1 each time: +++ (3), *** (4), +++ (3), **** (4), +++++ (5), ****** (6). The next group after **** should be 7 + symbols, but the position shown with ? ? follows a + group. Since we alternate symbols and the sequence continues, ? ? represents the next two symbols after the established +++++ pattern.