-er -ic bbb bbc bbe bbi bbk bbn bbo bbr bbt bcb bcc bce bci bck bcn bco bcr bct be- beb bec bee bei bek ben beo ber bet bi- bib bic bie bii bik bin bio bir bit bkb bkc bke bkk bkn bko bkr bkt bnb bnc bne bni bnk bnn bno bnr bnt bob boc boe boi bok bon boo bor bot brb bre bri brk brn bro brr brt btb btc bte bti btk btn bto btr btt c-- cbb cbc cbe cbi cbk cbn cbo cbr cbt ccb ccc cce cci cck ccn cco ccr cct ce- ceb cec cee cei cek cen ceo cer cet ci- cib cic cie cii cik cin cio cir cit ckb ckc cki cko ckt cn- cnb cnc cne cni cnn cno cnr cnt co- cob coc coe coi cok con coo cor cot crb crc cre cri crk crn cro crr crt ctb ctc cte cti ctk ctn cto ctr ctt ebb ebc ebe ebi ebk ebn ebo ebr ebt ec- ecb ecc ece eci eck ecn eco ecr ect eeb eec eee eek een eeo eer eet eib eic eie eii eik ein eio eir eit ekb ekc eke eki eko ekr ekt en- enb enc ene eni enk enn eno enr ent eo- eob eoc eoe eoi eok eon eoo eor eot erb erc ere eri erk ern ero err ert etb etc ete eti etk etn eto etr ett ibb ibc ibe ibi ibk ibn ibo ibr ibt icb icc ice ici ick icn ico icr ict ie- iec iee iei iek ien ier iet iib iic iie iii iin iio iir iit ikb ikc ike iki ikk iko ikr ikt in- inb inc ine ini ink inn ino inr int io- iob ioc ioe ioi ion ioo ior iot ir- irb irc ire iri irk irn iro irr irt itb itc ite iti itk itn ito itt k-t kbb kbc kbe kbi kbk kbn kbo kbr kcb kcc kce kci kck kcn kcr kct ke- keb kec kee kei kek ken keo ker ket kib kic kie kii kik kin kio kir kit kkb kkc kke kki kkk kkn kkr kkt kn- knc kne kni knk knn kno knr knt kob koc koe koi kok kon koo kor kot krc kri krk krn kro krr krt ktb ktc kte ktk ktn kto ktr ktt n-i nbb nbc nbe nbi nbk nbn nbo nbr nbt ncb ncc nce nci nck ncn nco ncr nct ne- neb nec nee nei nek nen neo ner net nib nic nie nii nik nin nio nir nit nkc nke nki nkk nkn nko nkr nkt nnb nnc nne nni nnk nnn nno nnt no- nob noc noe noi nok non noo nor not nrb nrc nre nri nrk nrn nro nrr nrt ntb ntc nte nti ntk ntn nto ntr ntt o-i ob- obb obc obe obi obk obn obo obr obt oc- ocb occ oci ock ocn oco ocr oct oeb oec oee oei oen oeo oer oet oib oic oie oii oik oin oio oir oit okb okc oke oki okk oko okr on- onb onc one oni onk onn ono onr ont oo- oob ooc ooi ook oon ooo oor oot or- orb orc ore ori ork orn oro orr ort ot- otb otc ote oti otk otn oto otr ott rbb rbc rbe rbi rbk rbn rbo rbr rbt rcb rcc rce rci rcn rco rcr rct re- reb rec ree rei rek ren reo rer ret rib ric rie rii rik rin rio rir rit rkb rkc rke rkk rko rkt rnb rnc rni rnn rno rnr rnt rob roc roe roi rok ron roo ror rot rrb rrc rri rrk rrn rrr rrt rtb rtc rte rti rtk rtn rto rtr rtt tbb tbc tbe tbi tbk tbn tbo tbr tbt tcb tcc tce tci tck tcn tco tcr tct te- teb tec tee tei tek ten teo ter tet tib tic tie tii tik tin tio tir tit tkb tkc tke tkk tko tkr tkt tnb tnc tne tni tnk tnn tno tnr tnt to- tob toc toe toi tok ton too tor tot trb trc tre tri trk trn tro trr trt ttb ttc tte tti ttk ttn tto ttr ttt