-ic b-p bbb bbc bbi bbo bbp bbr bbs bbt bcb bcc bci bco bcp bcr bcs bct bi- bib bic bii bio bip bir bis bit bob boc boi boo bop bor bos bot bpb bpc bpi bpo bpp bpr bps bpt brb bri bro brp brr brs brt bsb bsc bsi bso bsp bsr bss bst btb btc bti bto btp btr bts btt c-- cbb cbc cbi cbo cbp cbr cbs cbt ccb ccc cci cco ccp ccr ccs cct ci- cib cic cii cio cip cir cis cit co- cob coc coi coo cop cor cos cot cpb cpc cpi cpo cpp cpr cps cpt crb crc cri cro crp crr crs crt csb csc csi cso csp csr css cst ctb ctc cti cto ctp ctr cts ctt ibb ibc ibi ibo ibp ibr ibs ibt icb icc ici ico icp icr ics ict iib iic iii iio iip iir iis iit io- iob ioc ioi ioo iop ior ios iot ipb ipc ipi ipo ipp ipr ips ipt ir- irb irc iri iro irp irr irs irt is- isb isc isi iso isp isr iss ist itb itc iti ito itp its itt o-i ob- obb obc obi obo obp obr obs obt oc- ocb occ oci oco ocp ocr ocs oct oib oic oii oio oip oir ois oit oo- oob ooc ooi ooo oop oor oos oot op- opb opc opi opo opp opr ops opt or- orb orc ori oro orp orr ors ort os- osb osc osi oso osp osr oss ost ot- otb otc oti oto otp otr ots ott p-p pbb pbc pbi pbo pbp pbr pbs pbt pcb pcc pci pco pcp pcr pcs pct pib pic pii pio pip pir pis pit pob poc poi poo pop por pos pot ppb ppc ppi ppo ppp ppr pps ppt prb prc pri pro prp prr prs prt ps- psb psc psi pso psp psr pss pst pt- ptb ptc pti pto ptp ptr pts ptt rbb rbc rbi rbo rbp rbr rbs rbt rcb rcc rci rco rcp rcr rcs rct rib ric rii rio rip rir ris rit rob roc roi roo rop ror ros rot rpb rpc rpi rpo rpp rpr rps rpt rrb rrc rri rrp rrr rrs rrt rsb rsc rsi rso rsp rsr rss rst rtb rtc rti rto rtp rtr rts rtt sbb sbc sbi sbo sbp sbr sbs sbt scb scc sci sco scp scr scs sct sib sic sii sio sip sir sis sit sob soc soi soo sop sor sos sot spb spc spi spo spp spr sps spt sr- srb src sri sro srp srr srs srt ss- ssb ssc ssi sso ssp ssr sss sst stb stc sti sto stp str sts stt tbb tbc tbi tbo tbp tbr tbs tbt tcb tcc tci tco tcp tcr tcs tct tib tic tii tio tip tir tis tit to- tob toc toi too top tor tos tot tpb tpc tpi tpo tpp tpr tps tpt trb trc tri tro trp trr trs trt tsb tsc tsi tso tsp tsr tss tst ttb ttc tti tto ttp ttr tts ttt