As the figure shows, every other number is a continuous rational number.

∴ 1 1 on Boshang,

∴ "12" in Lei Company,

∫ Every five rounds,

20 1 1÷5=402 The remainder is 1,

Every five rounds, the vertex cycles exactly once, and when 402÷5=80, the remainder is 2.

∴ "2011"is the same as the first number in the third round.

I.e. the same position as 9,

∴ "2011"is on Leibo.

So the answer is: CO, bo.