-er a-a a-b a-i aaa aab aae aai aam aan aao aar ab- aba abb abe abi abm abn abo abr aea aeb aee aei aem aen aeo aer ai- aia aib aie aii aim ain aio air ama amb ame ami amm amn amo amr an- ana anb ane ani anm ann ano anr aoa aob aoe aoi aom aon aoo aor ar- ara arb are ari arm arn aro arr baa bab bae bai bam ban bao bar bba bbb bbe bbi bbm bbn bbo bbr be- bea beb bee bei bem ben beo ber bi- bia bib bie bii bim bin bio bir bma bmb bme bmi bmm bmn bmo bmr bna bnb bne bni bnn bno bnr boa bob boe boi bom bon boo bor bra brb bre bri brm brn bro brr eaa eab eae eai eam ean eao ear eba ebb ebe ebi ebm ebn ebo ebr eea eeb eee eem een eeo eer eia eib eie eii eim ein eio eir em- ema emb eme emi emm emn emo emr en- ena enb ene eni enm enn eno enr eo- eoa eob eoe eoi eom eon eoo eor era erb ere eri erm ern ero err ia- iaa iab iae iai iam ian iao iar iba ibb ibe ibi ibm ibn ibo ibr ie- iea iee iei iem ien ier iia iib iie iii iim iin iio iir im- ima imb ime imi imm imn imo in- ina inb ine ini inm inn ino inr io- ioa iob ioe ioi iom ion ioo ior ir- ira irb ire iri irm irn iro irr m-o m-r maa mab mae mai mam man mao mar mba mbb mbe mbi mbm mbo mbr mea meb mee mei mem men meo mer mi- mia mib mie mii mim min mio mir mma mmb mme mmi mmm mmn mmo mmr mna mnb mne mni mnm mnn mno mnr moa mob moe moi mom mon moo mor mra mrb mre mri mrm mrn mro mrr n-i naa nab nae nai nam nan nao nar nba nbb nbe nbi nbm nbn nbo nbr ne- nea neb nee nei nem nen neo ner nia nib nie nii nim nin nio nir nma nmb nme nmi nmm nmn nmo nmr nna nnb nne nni nnm nnn nno no- noa nob noe noi nom non noo nor nra nrb nre nri nrm nrn nro nrr o-i oaa oab oae oai oam oan oao oar ob- oba obb obe obi obm obn obo obr oea oeb oee oei oem oen oeo oer oia oib oie oii oim oin oio oir om- oma omb ome omi omm omn omo omr on- ona onb one oni onn ono onr oo- ooa oob ooi oom oon ooo oor or- ora orb ore ori orm orn oro orr ra- raa rab rae rai ram ran rao rar rba rbb rbe rbi rbm rbn rbo rbr re- rea reb ree rei rem ren reo rer ria rib rie rii rim rin rio rir rma rmb rme rmi rmm rmn rmo rmr rna rnb rni rnm rnn rno rnr roa rob roe roi rom ron roo ror rra rrb rri rrm rrn rrr