B3311331313231311331322331333132313331322331323133313331313132313233232211   >>    B331133131323131133132233133313231333132233132313331333131313231323323221   <<    B3311331313231311331322331333132313331322331323133313331313132313233232213   >>      B3311331313231311331322331333132313331322331323133313331313132313233232212   >>