-ic b-p bbb bbc bbf bbi bbo bbp bbr bbt bcb bcc bcf bci bco bcp bcr bct bfb bfc bff bfi bfo bfp bfr bft bi- bib bic bif bii bio bip bir bit bob boc bof boi boo bop bor bot bpb bpc bpf bpi bpo bpp bpr bpt brb brf bri bro brp brr brt btb btc btf bti bto btp btr btt c-- cbb cbc cbf cbi cbo cbp cbr cbt ccb ccc ccf cci cco ccp ccr cct cfb cfc cff cfi cfo cfp cfr cft ci- cib cic cif cii cio cip cir cit co- cob coc cof coi coo cop cor cot cpb cpc cpf cpi cpo cpp cpr cpt crb crc crf cri cro crp crr crt ctb ctc ctf cti cto ctp ctr ctt fbb fbc fbf fbi fbo fbp fbr fbt fcb fcc fcf fci fco fcp fcr fct ffc fff ffi ffo ffp ffr fft fib fic fif fii fip fir fit fob foc fof foi foo fop for fot fpb fpc fpi fpo fpp fpr fpt frb frc frf fri fro frp frr frt ftb ftc ftf fti fto ftp ftr ftt i-f ibb ibc ibf ibi ibo ibp ibr ibt icb icc icf ici ico icp icr ict ifb ifc iff ifi ifo ifp ifr ift iib iic iif iii iio iip iir iit io- iob ioc iof ioi ioo iop ior iot ipb ipc ipf ipi ipo ipp ipr ipt ir- irb irc irf iri iro irp irr irt itb itc itf iti ito itp itt o-i ob- obb obc obf obi obo obp obr obt oc- ocb occ ocf oci oco ocp ocr oct of- ofb ofc off ofi ofo ofp ofr oft oib oic oif oii oio oip oir oit oo- oob ooc oof ooi ooo oop oor oot op- opb opc opf opi opo opp opr opt or- orb orc orf ori oro orp orr ort ot- otb otc otf oti oto otp otr ott p-p pbb pbc pbf pbi pbo pbp pbr pbt pcb pcc pcf pci pco pcp pcr pct pfb pfc pff pfi pfo pfp pfr pft pib pic pif pii pio pip pir pit pob poc pof poi poo pop por pot ppb ppc ppf ppi ppo ppp ppr ppt prb prc prf pri pro prp prr prt pt- ptb ptc ptf pti pto ptp ptr ptt rbb rbc rbf rbi rbo rbp rbr rbt rcb rcc rcf rci rco rcp rcr rct rfb rfc rff rfi rfo rfp rfr rft rib ric rif rii rio rip rir rit rob roc rof roi roo rop ror rot rpb rpc rpf rpi rpo rpp rpr rpt rrb rrc rrf rri rrp rrr rrt rtb rtc rtf rti rto rtp rtr rtt tbb tbc tbf tbi tbo tbp tbr tbt tcb tcc tcf tci tco tcp tcr tct tfb tfc tff tfi tfo tfp tfr tft tib tic tif tii tio tip tir tit to- tob toc tof toi too top tor tot tpb tpc tpf tpi tpo tpp tpr tpt trb trc trf tri tro trp trr trt ttb ttc ttf tti tto ttp ttr ttt