C1111233131211111211113313331333133313331313221131211113313233121311   >>    C111123313121111121111331333133313331333131322113121111331323312131   <<    C1111233131211111211113313331333133313331313221131211113313233121313   >>      C1111233131211111211113313331333133313331313221131211113313233121312   >>