CR_SL4
[2] = CR_SL3 | CR_SL4,
[4] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8,
[6] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8 | CR_SL6 | CR_SL9,