C11212213133313132313231322132313231333132313112331323331323233232211   >>    C1121221313331313231323132213231323133313231311233132333132323323221   <<    C11212213133313132313231322132313231333132313112331323331323233232213   >>      C11212213133313132313231322132313231333132313112331323331323233232212   >>