B3311331313231311331322331333132313233313233231333133313331323233211   >>    B331133131323131133132233133313231323331323323133313331333132323321   <<    B3311331313231311331322331333132313233313233231333133313331323233213   >>      B3311331313231311331322331333132313233313233231333133313331323233212   >>