-ol c-- ccc ccl cco ccr ccx cl- clc cll clo clr clx co- coc col coo cor cox crc crl cro crr crx cxc cxl cxo cxr cxx lcc lcl lco lcr lcx llc lll llo llr loc lol loo lor lox lrc lro lrr lxc lxo lxr lxx oc- occ ocl oco ocr ocx olc oll olo oo- ooc ool ooo oor oox or- orc orl oro orr orx ox- oxc oxo oxx rcc rcl rco rcr rcx rlc rll rlo rlr roc rol roo ror rox rrc rrl rrr rxr xcl xcr xcx xlr xoc xoo xor xox xrc xrx xxl xxo xxx