B3311331313231311331322331333132313231323331333131133133313233313232213221221   >>    B331133131323131133132233133313231323132333133313113313331323331323221322122   <<    B3311331313231311331322331333132313231323331333131133133313233313232213221223   >>      B3311331313231311331322331333132313231323331333131133133313233313232213221222   >>