a-a a-b aaa aab aak aan aao aap aay ab- aba abb abk abn abo abp aby aka akb akk akn ako akp an- ana anb ank ann ano anp any aoa aob aok aon aoo aop ap- apa apb apk apn apo app apy ay- aya ayk ayn ayo ayp b-p baa bab bak ban bao bap bay bba bbb bbk bbn bbo bbp bby bka bkb bkk bkn bko bkp bna bnb bnk bnn bno bnp boa bob bok bon boo bop boy bpa bpb bpn bpo bpp bpy by- bya byk byn byo byp ka- kaa kab kak kan kao kap kay kba kbb kbk kbn kbo kbp kkb kkk kkn kkp kky kn- kna knk knn kno knp koa kob kok kon koo kop koy kpa kpk kpn kpo kpp kya kyn kyo kyp naa nab nak nan nao nap nay nba nbb nbk nbn nbo nbp nka nkk nkn nko nkp nky nna nnb nnk nnn nno nnp no- noa nob nok non noo nop noy npa npb npn npo npp nya nyk nyn nyo nyp nyy oaa oab oak oan oao oap ob- oba obb obk obn obo obp oby oka okb okk oko okp on- ona onb onk onn ono onp ony oo- ooa oob ook oon ooo oop op- opa opb opk opn opo opp opy oya oyo p-p paa pab pak pan pao pap pay pba pbb pbk pbn pbo pbp pby pka pkb pkn pko pkp pky pn- pna pnb pnk pnn pno pnp pny poa pob pok pon poo pop poy ppa ppb ppk ppn ppo ppp py- pya pyb pyk pyn pyo yaa yab yak yan yao yap yay ybp yby yka ykk ykn yna ynk ynn ynp yny yob yok yon yoo yop yoy ypa ypo yyb yyy