-ic b-p bbb bbc bbi bbo bbp bbr bbs bcb bcc bci bco bcp bcr bcs bi- bib bic bii bio bip bir bis bob boc boi boo bop bor bos bpb bpc bpi bpo bpp bpr bps brb bri bro brp brr brs bsb bsc bsi bso bsp bsr bss c-- cbb cbc cbi cbo cbp cbr cbs ccb ccc cci cco ccp ccr ccs ci- cib cic cii cio cip cir cis co- cob coc coi coo cop cor cos cpb cpc cpi cpo cpp cpr cps crb crc cri cro crp crr crs csb csc csi cso csp csr css ibb ibc ibi ibo ibp ibr ibs icb icc ici ico icp icr ics iib iic iii iio iip iir iis io- iob ioc ioi ioo iop ior ios ipb ipc ipi ipo ipp ipr ips ir- irb irc iri iro irp irr irs is- isb isc isi iso isp isr iss o-i ob- obb obc obi obo obp obr obs oc- ocb occ oci oco ocp ocr ocs oib oic oii oio oip oir ois oo- oob ooc ooi ooo oop oor oos op- opb opc opi opo opp opr ops or- orb orc ori oro orp orr ors os- osb osc osi oso osp osr oss p-p pbb pbc pbi pbo pbp pbr pbs pcb pcc pci pco pcp pcr pcs pib pic pii pio pip pir pis pob poc poi poo pop por pos ppb ppc ppi ppo ppp ppr pps prb prc pri pro prp prr prs ps- psb psc psi pso psp psr pss rbb rbc rbi rbo rbp rbr rbs rcb rcc rci rco rcp rcr rcs rib ric rii rio rip rir ris rob roc roi roo rop ror ros rpb rpc rpi rpo rpp rpr rps rrb rrc rri rrp rrr rrs rsb rsc rsi rso rsp rsr rss sbb sbc sbi sbo sbp sbr sbs scb scc sci sco scp scr scs sib sic sii sio sip sir sis sob soc soi soo sop sor sos spb spc spi spo spp spr sps sr- srb src sri sro srp srr srs ss- ssb ssc ssi sso ssp ssr sss