a-a a-b aaa aab aae aag aak aan aao ab- aba abb abe abg abk abn abo aea aeb aee aeg aek aen aeo ag- aga agb age agg agk agn ago aka akb ake akg akk akn ako an- ana anb ane ang ank ann ano aoa aob aoe aog aok aon aoo baa bab bae bag bak ban bao bba bbb bbe bbg bbk bbn bbo be- bea beb bee beg bek ben beo bga bgb bge bgg bgk bgn bgo bka bkb bke bkg bkk bkn bko bna bnb bne bng bnk bnn bno boa bob boe bog bok bon boo eaa eab eae eag eak ean eao eba ebb ebe ebg ebk ebn ebo eea eeb eee eeg eek een eeo ega egb ege egg egn ego eka ekb eke ekg eko en- ena enb ene eng enk enn eno eo- eoa eob eoe eog eok eon eoo gaa gab gae gag gak gan gao gba gbe gbg gbk gbn gbo ge- gea geb gee geg gek gen geo gga ggb ggg ggn ggo gka gkb gkn gko gna gnb gne gnn gno goa gob goe gog gok gon goo ka- kaa kab kae kag kak kan kao kba kbb kbe kbk kbn kbo ke- kea keb kee keg kek ken keo kga kgb kgo kkb kke kkk kkn kn- kna kne kng knk knn kno koa kob koe kog kok kon koo naa nab nae nag nak nan nao nba nbb nbe nbg nbk nbn nbo ne- nea neb nee neg nek nen neo nga ngb nge ngg ngk ngn ngo nka nke nkk nkn nko nna nnb nne nng nnk nnn nno no- noa nob noe nog nok non noo oaa oab oae oag oak oan oao ob- oba obb obe obg obk obn obo oea oeb oee oeg oen oeo oga oge ogg ogn ogo oka okb oke okg okk oko on- ona onb one ong onk onn ono oo- ooa oob oog ook oon ooo