C2122121212121133132233131333132213231333132313231323132313231221   >>    C212212121212113313223313133313221323133313231323132313231323122   <<    C2122121212121133132233131333132213231333132313231323132313231223   >>      C2122121212121133132233131333132213231333132313231323132313231222   >>