a-a a-b a-c aaa aab aac aae aag aan aao aau ab- aba abb abc abe abg abn abo abu ac- aca acb acc ace acg acn aco acu aea aeb aec aee aeg aen aeo aeu ag- aga agb agc age agg agn ago agu an- ana anb anc ane ang ann ano anu aoa aob aoc aoe aog aon aoo aou au- aua aub auc aue aug aun auo b-u baa bab bac bae bag ban bao bau bba bbb bbc bbe bbg bbn bbo bbu bca bcb bcc bce bcg bcn bco bcu be- bea beb bec bee beg ben beo beu bga bgb bgc bge bgg bgn bgo bgu bna bnb bnc bne bng bnn bno bnu boa bob boc boe bog bon boo bou bua bub buc bue bug bun buo buu c-- caa cab cac cae cag can cao cau cba cbb cbc cbe cbg cbn cbo cbu cca ccb ccc cce ccg ccn cco ccu ce- cea ceb cec cee ceg cen ceo ceu cga cgb cgc cge cgg cgn cgo cgu cn- cna cnb cnc cne cng cnn cno cnu co- coa cob coc coe cog con coo cou cua cub cuc cue cug cun cuo cuu eaa eab eac eae eag ean eao eau eba ebb ebc ebe ebg ebn ebo ebu ec- eca ecb ecc ece ecg ecn eco ecu eea eeb eec eee eeg een eeo ega egb egc ege egg egn ego egu en- ena enb enc ene eng enn eno enu eo- eoa eob eoc eoe eog eon eoo eou eu- eua eub euc eue eug eun gaa gab gac gae gag gan gao gau gba gbc gbe gbg gbn gbo gbu gca gcb gcc gce gcg gcn gco gcu ge- gea geb gec gee geg gen geo geu gga ggb ggc ggg ggn ggo ggu gna gnb gnc gne gnn gno gnu goa gob goc goe gog gon goo gou gu- gua gub guc gue gug gun guo guu naa nab nac nae nag nan nao nau nba nbb nbc nbe nbg nbn nbo nbu nca ncb ncc nce ncg ncn nco ncu ne- nea neb nec nee neg nen neo neu nga ngb ngc nge ngg ngn ngo ngu nna nnb nnc nne nng nnn nno nnu no- noa nob noc noe nog non noo nou nua nub nuc nue nug nun nuo nuu oaa oab oac oae oag oan oao oau ob- oba obb obc obe obg obn obo obu oc- oca ocb occ ocg ocn oco ocu oea oeb oec oee oeg oen oeo oga ogc oge ogg ogn ogo on- ona onb onc one ong onn ono onu oo- ooa oob ooc oog oon ooo ou- oua ouc oue oun ouo ua- uaa uab uac uae uag uan uao uau uba ubb ubc ube ubg ubn ubo ubu uca ucb ucc uce ucg ucn uco ucu uea ueb uec uee ueg uen uga ugb ugc uge ugg ugn ugo ugu un- una unb unc une ung unn uno unu uoa uob uoc uoe uog uon uoo uua uuc uue uug uun uuu