C11111211113313112113313331333133313133313232233133112323232321   >>    C1111121111331311211331333133313331313331323223313311232323232   <<    C11111211113313112113313331333133313133313232233133112323232323   >>      C11111211113313112113313331333133313133313232233133112323232322   >>