-ic b-p bbb bbc bbi bbo bbp bbr bbt bcb bcc bci bco bcp bcr bct bi- bib bic bii bio bip bir bit bob boc boi boo bop bor bot bpb bpc bpi bpo bpp bpr bpt brb bri bro brp brr brt btb btc bti bto btp btr btt c-- cbb cbc cbi cbo cbp cbr cbt ccb ccc cci cco ccp ccr cct ci- cib cic cii cio cip cir cit co- cob coc coi coo cop cor cot cpb cpc cpi cpo cpp cpr cpt crb crc cri cro crp crr crt ctb ctc cti cto ctp ctr ctt ibb ibc ibi ibo ibp ibr ibt icb icc ici ico icp icr ict iib iic iii iio iip iir iit io- iob ioc ioi ioo iop ior iot ipb ipc ipi ipo ipp ipr ipt ir- irb irc iri iro irp irr irt itb itc iti ito itp itt o-i ob- obb obc obi obo obp obr obt oc- ocb occ oci oco ocp ocr oct oib oic oii oio oip oir oit oo- oob ooc ooi ooo oop oor oot op- opb opc opi opo opp opr opt or- orb orc ori oro orp orr ort ot- otb otc oti oto otp otr ott p-p pbb pbc pbi pbo pbp pbr pbt pcb pcc pci pco pcp pcr pct pib pic pii pio pip pir pit pob poc poi poo pop por pot ppb ppc ppi ppo ppp ppr ppt prb prc pri pro prp prr prt pt- ptb ptc pti pto ptp ptr ptt rbb rbc rbi rbo rbp rbr rbt rcb rcc rci rco rcp rcr rct rib ric rii rio rip rir rit rob roc roi roo rop ror rot rpb rpc rpi rpo rpp rpr rpt rrb rrc rri rrp rrr rrt rtb rtc rti rto rtp rtr rtt tbb tbc tbi tbo tbp tbr tbt tcb tcc tci tco tcp tcr tct tib tic tii tio tip tir tit to- tob toc toi too top tor tot tpb tpc tpi tpo tpp tpr tpt trb trc tri tro trp trr trt ttb ttc tti tto ttp ttr ttt