a-a a-b a-c a-t aaa aab aac aae aam aan aao aat ab- aba abb abc abe abm abn abo abt ac- aca acb acc ace acm acn aco act aea aeb aec aee aem aen aeo aet ama amb amc ame amm amn amo amt an- ana anb anc ane anm ann ano ant aoa aob aoc aoe aom aon aoo aot at- ata atb atc ate atm atn ato att baa bab bac bae bam ban bao bat bba bbb bbc bbe bbm bbn bbo bbt bca bcb bcc bce bcm bcn bco bct be- bea beb bec bee bem ben beo bet bma bmb bmc bme bmm bmn bmo bmt bna bnb bnc bne bnn bno bnt boa bob boc boe bom bon boo bot bta btb btc bte btm btn bto btt c-- caa cab cac cae cam can cao cat cba cbb cbc cbe cbm cbn cbo cbt cca ccb ccc cce ccm ccn cco cct ce- cea ceb cec cee cem cen ceo cet cma cmb cmc cme cmm cmn cmo cmt cn- cna cnb cnc cne cnm cnn cno cnt co- coa cob coc coe com con coo cot cta ctb ctc cte ctm ctn cto ctt eaa eab eac eae eam ean eao eat eba ebb ebc ebe ebm ebn ebo ebt ec- eca ecb ecc ece ecm ecn eco ect eea eeb eec eee eem een eeo eet em- ema emb emc eme emm emn emo emt en- ena enb enc ene enm enn eno ent eo- eoa eob eoc eoe eom eon eoo eot eta etb etc ete etm etn eto ett m-o maa mab mac mae mam man mao mat mba mbb mbc mbe mbm mbo mbt mc- mca mcb mcc mce mcm mcn mco mct mea meb mec mee mem men meo met mma mmb mmc mme mmm mmn mmo mmt mna mnb mnc mne mnm mnn mno mnt moa mob moc moe mom mon moo mot mta mtb mtc mte mtm mtn mto mtt naa nab nac nae nam nan nao nat nba nbb nbc nbe nbm nbn nbo nbt nca ncb ncc nce ncm ncn nco nct ne- nea neb nec nee nem nen neo net nma nmb nmc nme nmm nmn nmo nmt nna nnb nnc nne nnm nnn nno nnt no- noa nob noc noe nom non noo not nta ntb ntc nte ntm ntn nto ntt oaa oab oac oae oam oan oao oat ob- oba obb obc obe obm obn obo obt oc- oca ocb occ ocm ocn oco oct oea oeb oec oee oem oen oeo oet om- oma omb omc ome omm omn omo omt on- ona onb onc one onn ono ont oo- ooa oob ooc oom oon ooo oot ot- ota otb otc ote otm otn oto ott taa tab tac tae tam tan tao tat tba tbb tbc tbe tbm tbn tbo tbt tca tcb tcc tce tcm tcn tco tct te- tea teb tec tee tem ten teo tet tma tmb tmc tme tmm tmn tmo tmt tna tnb tnc tne tnm tnn tno tnt to- toa tob toc toe tom ton too tot tta ttb ttc tte ttm ttn tto ttt