-er a-a a-b a-i aaa aab aae aai aak aam aan aar ab- aba abb abe abi abk abm abn abr aea aeb aee aei aek aem aen aer ai- aia aib aie aii aik aim ain air aka akb ake aki akk akm akn akr ama amb ame ami amk amm amn amr an- ana anb ane ani ank anm ann anr ar- ara arb are ari ark arm arn arr baa bab bae bai bak bam ban bar bba bbb bbe bbi bbk bbm bbn bbr be- bea beb bee bei bek bem ben ber bi- bia bib bie bii bik bim bin bir bka bkb bke bkk bkm bkn bkr bma bmb bme bmi bmk bmm bmn bmr bna bnb bne bni bnk bnn bnr bra brb bre bri brk brm brn brr eaa eab eae eai eak eam ean ear eba ebb ebe ebi ebk ebm ebn ebr eea eeb eee eek eem een eer eia eib eie eii eik eim ein eir eka ekb eke eki ekr em- ema emb eme emi emk emm emn emr en- ena enb ene eni enk enm enn enr era erb ere eri erk erm ern err ia- iaa iab iae iai iam ian iar iba ibb ibe ibi ibk ibm ibn ibr ie- iea iee iei iek iem ien ier iia iib iie iii iim iin iir ika ikb ike iki ikk ikr im- ima imb ime imi imm imn in- ina inb ine ini ink inm inn inr ir- ira irb ire iri irk irm irn irr ka- kaa kab kae kai kak kam kan kar kba kbb kbe kbi kbk kbm kbn kbr ke- kea keb kee kei kek kem ken ker kia kib kie kii kik kim kin kir kkb kke kki kkk kkm kkn kkr kma kmb kme kmi kmk kmm kn- kna kne kni knk knm knn knr kra kri krk krn krr m-r maa mab mae mai mak mam man mar mba mbb mbe mbi mbk mbm mbr mea meb mee mei mek mem men mer mi- mia mib mie mii mik mim min mir mka mkb mke mkk mkm mkn mkr mma mmb mme mmi mmk mmm mmn mmr mna mnb mne mni mnk mnm mnn mnr mra mrb mre mri mrk mrm mrn mrr n-i naa nab nae nai nak nam nan nar nba nbb nbe nbi nbk nbm nbn nbr ne- nea neb nee nei nek nem nen ner nia nib nie nii nik nim nin nir nka nke nki nkk nkm nkn nkr nma nmb nme nmi nmk nmm nmn nmr nna nnb nne nni nnk nnm nnn nra nrb nre nri nrk nrm nrn nrr ra- raa rab rae rai rak ram ran rar rba rbb rbe rbi rbk rbm rbn rbr re- rea reb ree rei rek rem ren rer ria rib rie rii rik rim rin rir rkb rke rkk rkm rma rmb rme rmi rmm rmn rmr rna rnb rni rnm rnn rnr rra rrb rri rrk rrm rrn rrr