-ic b-p bbb bbc bbi bbn bbo bbp bbr bbs bcb bcc bci bcn bco bcp bcr bcs bi- bib bic bii bin bio bip bir bis bnb bnc bni bnn bno bnp bnr bns bob boc boi bon boo bop bor bos bpb bpc bpi bpn bpo bpp bpr bps brb bri brn bro brp brr brs bsb bsc bsi bsn bso bsp bsr bss c-- cbb cbc cbi cbn cbo cbp cbr cbs ccb ccc cci ccn cco ccp ccr ccs ci- cib cic cii cin cio cip cir cis cn- cnb cnc cni cnn cno cnp cnr cns co- cob coc coi con coo cop cor cos cpb cpc cpi cpn cpo cpp cpr cps crb crc cri crn cro crp crr crs csb csc csi csn cso csp csr css ibb ibc ibi ibn ibo ibp ibr ibs icb icc ici icn ico icp icr ics iib iic iii iin iio iip iir iis in- inb inc ini inn ino inp inr ins io- iob ioc ioi ion ioo iop ior ios ipb ipc ipi ipn ipo ipp ipr ips ir- irb irc iri irn iro irp irr irs is- isb isc isi isn iso isp isr iss n-i nbb nbc nbi nbn nbo nbp nbr nbs ncb ncc nci ncn nco ncp ncr ncs nib nic nii nin nio nip nir nis nnb nnc nni nnn nno nnp nns no- nob noc noi non noo nop nor nos npb npc npi npn npo npp npr nps nrb nrc nri nrn nro nrp nrr nrs nsb nsc nsi nsn nso nsp nsr nss o-i ob- obb obc obi obn obo obp obr obs oc- ocb occ oci ocn oco ocp ocr ocs oib oic oii oin oio oip oir ois on- onb onc oni onn ono onp onr ons oo- oob ooc ooi oon ooo oop oor oos op- opb opc opi opn opo opp opr ops or- orb orc ori orn oro orp orr ors os- osb osc osi osn oso osp osr oss p-p pbb pbc pbi pbn pbo pbp pbr pbs pcb pcc pci pcn pco pcp pcr pcs pib pic pii pin pio pip pir pis pn- pnb pnc pni pnn pno pnp pnr pns pob poc poi pon poo pop por pos ppb ppc ppi ppn ppo ppp ppr pps prb prc pri prn pro prp prr prs ps- psb psc psi psn pso psp psr pss rbb rbc rbi rbn rbo rbp rbr rbs rcb rcc rci rcn rco rcp rcr rcs rib ric rii rin rio rip rir ris rnb rnc rni rnn rno rnp rnr rns rob roc roi ron roo rop ror ros rpb rpc rpi rpn rpo rpp rpr rps rrb rrc rri rrn rrp rrr rrs rsb rsc rsi rsn rso rsp rsr rss sbb sbc sbi sbn sbo sbp sbr sbs scb scc sci scn sco scp scr scs sib sic sii sin sio sip sir sis snb snc sni snn sno snp snr sns sob soc soi son soo sop sor sos spb spc spi spn spo spp spr sps sr- srb src sri srn sro srp srr srs ss- ssb ssc ssi ssn sso ssp ssr sss