-ic bbb bbc bbi bbn bbo bbr bbs bbt bcb bcc bci bcn bco bcr bcs bct bi- bib bic bii bin bio bir bis bit bnb bnc bni bnn bno bnr bns bnt bob boc boi bon boo bor bos bot brb bri brn bro brr brs brt bsb bsc bsi bsn bso bsr bss bst btb btc bti btn bto btr bts btt c-- cbb cbc cbi cbn cbo cbr cbs cbt ccb ccc cci ccn cco ccr ccs cct ci- cib cic cii cin cio cir cis cit cn- cnb cnc cni cnn cno cnr cns cnt co- cob coc coi con coo cor cos cot crb crc cri crn cro crr crs crt csb csc csi csn cso csr css cst ctb ctc cti ctn cto ctr cts ctt ibb ibc ibi ibn ibo ibr ibs ibt icb icc ici icn ico icr ics ict iib iic iii iin iio iir iis iit in- inb inc ini inn ino inr ins int io- iob ioc ioi ion ioo ior ios iot ir- irb irc iri irn iro irr irs irt is- isb isc isi isn iso isr iss ist itb itc iti itn ito its itt n-i nbb nbc nbi nbn nbo nbr nbs nbt ncb ncc nci ncn nco ncr ncs nct nib nic nii nin nio nir nis nit nnb nnc nni nnn nno nns nnt no- nob noc noi non noo nor nos not nrb nrc nri nrn nro nrr nrs nrt nsb nsc nsi nsn nso nsr nss nst ntb ntc nti ntn nto ntr nts ntt o-i ob- obb obc obi obn obo obr obs obt oc- ocb occ oci ocn oco ocr ocs oct oib oic oii oin oio oir ois oit on- onb onc oni onn ono onr ons ont oo- oob ooc ooi oon ooo oor oos oot or- orb orc ori orn oro orr ors ort os- osb osc osi osn oso osr oss ost ot- otb otc oti otn oto otr ots ott rbb rbc rbi rbn rbo rbr rbs rbt rcb rcc rci rcn rco rcr rcs rct rib ric rii rin rio rir ris rit rnb rnc rni rnn rno rnr rns rnt rob roc roi ron roo ror ros rot rrb rrc rri rrn rrr rrs rrt rsb rsc rsi rsn rso rsr rss rst rtb rtc rti rtn rto rtr rts rtt sbb sbc sbi sbn sbo sbr sbs sbt scb scc sci scn sco scr scs sct sib sic sii sin sio sir sis sit snb snc sni snn sno snr sns snt sob soc soi son soo sor sos sot sr- srb src sri srn sro srr srs srt ss- ssb ssc ssi ssn sso ssr sss sst stb stc sti stn sto str sts stt tbb tbc tbi tbn tbo tbr tbs tbt tcb tcc tci tcn tco tcr tcs tct tib tic tii tin tio tir tis tit tnb tnc tni tnn tno tnr tns tnt to- tob toc toi ton too tor tos tot trb trc tri trn tro trr trs trt tsb tsc tsi tsn tso tsr tss tst ttb ttc tti ttn tto ttr tts ttt