-ic b-p bbb bbc bbi bbo bbp bbr bcb bcc bci bco bcp bcr bi- bib bic bii bio bip bir bob boc boi boo bop bor bpb bpc bpi bpo bpp bpr brb bri bro brp brr c-- cbb cbc cbi cbo cbp cbr ccb ccc cci cco ccp ccr ci- cib cic cii cio cip cir co- cob coc coi coo cop cor cpb cpc cpi cpo cpp cpr crb crc cri cro crp crr ibb ibc ibi ibo ibp ibr icb icc ici ico icp icr iib iic iii iio iip iir io- iob ioc ioi ioo iop ior ipb ipc ipi ipo ipp ipr ir- irb irc iri iro irp irr o-i ob- obb obc obi obo obp obr oc- ocb occ oci oco ocp ocr oib oic oii oio oip oir oo- oob ooc ooi ooo oop oor op- opb opc opi opo opp opr or- orb orc ori oro orp orr p-p pbb pbc pbi pbo pbp pbr pcb pcc pci pco pcp pcr pib pic pii pio pip pir pob poc poi poo pop por ppb ppc ppi ppo ppp ppr prb prc pri pro prp prr rbb rbc rbi rbo rbp rbr rcb rcc rci rco rcp rcr rib ric rii rio rip rir rob roc roi roo rop ror rpb rpc rpi rpo rpp rpr rrb rrc rri rrp rrr