-er -ic bbb bbc bbe bbi bbk bbm bbn bbr bcb bcc bce bci bck bcm bcn bcr be- beb bec bee bei bek bem ben ber bi- bib bic bie bii bik bim bin bir bkb bkc bke bkk bkm bkn bkr bmb bmc bme bmi bmk bmm bmn bmr bnb bnc bne bni bnk bnn bnr brb bre bri brk brm brn brr c-- cbb cbc cbe cbi cbk cbm cbn cbr ccb ccc cce cci cck ccm ccn ccr ce- ceb cec cee cei cek cem cen cer ci- cib cic cie cii cik cim cin cir ckb ckc cki ckm cmb cmc cme cmi cmk cmm cmn cmr cn- cnb cnc cne cni cnm cnn cnr crb crc cre cri crk crm crn crr ebb ebc ebe ebi ebk ebm ebn ebr ec- ecb ecc ece eci eck ecm ecn ecr eeb eec eee eek eem een eer eib eic eie eii eik eim ein eir ekb ekc eke eki ekr em- emb emc eme emi emk emm emn emr en- enb enc ene eni enk enm enn enr erb erc ere eri erk erm ern err ibb ibc ibe ibi ibk ibm ibn ibr icb icc ice ici ick icm icn icr ie- iec iee iei iek iem ien ier iib iic iie iii iim iin iir ikb ikc ike iki ikk ikr im- imb imc ime imi imm imn in- inb inc ine ini ink inm inn inr ir- irb irc ire iri irk irm irn irr kbb kbc kbe kbi kbk kbm kbn kbr kcb kcc kce kci kck kcm kcn kcr ke- keb kec kee kei kek kem ken ker kib kic kie kii kik kim kin kir kkb kkc kke kki kkk kkm kkn kkr kmb kmc kme kmi kmk kmm kn- knc kne kni knk knm knn knr krc kri krk krn krr m-r mbb mbc mbe mbi mbk mbm mbr mc- mcb mcc mce mci mck mcm mcn mcr meb mec mee mei mek mem men mer mi- mib mic mie mii mik mim min mir mkb mkc mke mkk mkm mkn mkr mmb mmc mme mmi mmk mmm mmn mmr mnb mnc mne mni mnk mnm mnn mnr mrb mrc mre mri mrk mrm mrn mrr n-i nbb nbc nbe nbi nbk nbm nbn nbr ncb ncc nce nci nck ncm ncn ncr ne- neb nec nee nei nek nem nen ner nib nic nie nii nik nim nin nir nkc nke nki nkk nkm nkn nkr nmb nmc nme nmi nmk nmm nmn nmr nnb nnc nne nni nnk nnm nnn nrb nrc nre nri nrk nrm nrn nrr rbb rbc rbe rbi rbk rbm rbn rbr rcb rcc rce rci rcm rcn rcr re- reb rec ree rei rek rem ren rer rib ric rie rii rik rim rin rir rkb rkc rke rkk rkm rmb rmc rme rmi rmm rmn rmr rnb rnc rni rnm rnn rnr rrb rrc rri rrk rrm rrn rrr