a-a a-b a-i aaa aab aai aam aan aao aar aas ab- aba abb abi abm abn abo abr abs ai- aia aib aii aim ain aio air ais ama amb ami amm amn amo amr ams an- ana anb ani anm ann ano anr ans aoa aob aoi aom aon aoo aor aos ar- ara arb ari arm arn aro arr ars as- asa asb asi asm asn aso asr ass baa bab bai bam ban bao bar bas bba bbb bbi bbm bbn bbo bbr bbs bi- bia bib bii bim bin bio bir bis bma bmb bmi bmm bmn bmo bmr bms bna bnb bni bnn bno bnr bns boa bob boi bom bon boo bor bos bra brb bri brm brn bro brr brs bsa bsb bsi bsm bsn bso bsr bss ia- iaa iab iai iam ian iao iar ias iba ibb ibi ibm ibn ibo ibr ibs iia iib iii iim iin iio iir iis im- ima imb imi imm imn imo ims in- ina inb ini inm inn ino inr ins io- ioa iob ioi iom ion ioo ior ios ir- ira irb iri irm irn iro irr irs is- isa isb isi ism isn iso isr iss m-o m-r maa mab mai mam man mao mar mas mba mbb mbi mbm mbo mbr mbs mi- mia mib mii mim min mio mir mis mma mmb mmi mmm mmn mmo mmr mms mna mnb mni mnm mnn mno mnr mns moa mob moi mom mon moo mor mos mra mrb mri mrm mrn mro mrr mrs msa msb msi msm msn mso msr mss n-i naa nab nai nam nan nao nar nas nba nbb nbi nbm nbn nbo nbr nbs nia nib nii nim nin nio nir nis nma nmb nmi nmm nmn nmo nmr nms nna nnb nni nnm nnn nno nns no- noa nob noi nom non noo nor nos nra nrb nri nrm nrn nro nrr nrs nsa nsb nsi nsm nsn nso nsr nss o-i oaa oab oai oam oan oao oar oas ob- oba obb obi obm obn obo obr obs oia oib oii oim oin oio oir ois om- oma omb omi omm omn omo omr oms on- ona onb oni onn ono onr ons oo- ooa oob ooi oom oon ooo oor oos or- ora orb ori orm orn oro orr ors os- osa osb osi osm osn oso osr oss ra- raa rab rai ram ran rao rar ras rba rbb rbi rbm rbn rbo rbr rbs ria rib rii rim rin rio rir ris rma rmb rmi rmm rmn rmo rmr rms rna rnb rni rnm rnn rno rnr rns roa rob roi rom ron roo ror ros rra rrb rri rrm rrn rrr rrs rsa rsb rsi rsm rsn rso rsr rss saa sab sai sam san sao sar sas sba sbb sbi sbm sbn sbo sbr sbs sia sib sii sim sin sio sir sis sma smb smi smm smn smo smr sms sna snb sni snm snn sno snr sns soa sob soi som son soo sor sos sr- sra srb sri srm srn sro srr srs ss- ssa ssb ssi ssm ssn sso ssr sss