a-a a-b a-t aaa aab aae aan aao aap aat ab- aba abb abe abn abo abp abt aea aeb aee aen aeo aep aet an- ana anb ane ann ano anp ant aoa aob aoe aon aoo aop aot ap- apa apb ape apn apo app apt at- ata atb ate atn ato atp att b-p baa bab bae ban bao bap bat bba bbb bbe bbn bbo bbp bbt be- bea beb bee ben beo bep bet bna bnb bne bnn bno bnp bnt boa bob boe bon boo bop bot bpa bpb bpe bpn bpo bpp bpt bta btb bte btn bto btp btt eaa eab eae ean eao eap eat eba ebb ebe ebn ebo ebp ebt eea eeb eee een eeo eep eet en- ena enb ene enn eno enp ent eo- eoa eob eoe eon eoo eop eot ep- epa epb epe epn epo epp ept eta etb ete etn eto etp ett naa nab nae nan nao nap nat nba nbb nbe nbn nbo nbp nbt ne- nea neb nee nen neo nep net nna nnb nne nnn nno nnp nnt no- noa nob noe non noo nop not npa npb npe npn npo npp npt nta ntb nte ntn nto ntp ntt oaa oab oae oan oao oap oat ob- oba obb obe obn obo obp obt oea oeb oee oen oeo oep oet on- ona onb one onn ono onp ont oo- ooa oob oon ooo oop oot op- opa opb ope opn opo opp opt ot- ota otb ote otn oto otp ott p-p paa pab pae pan pao pap pat pba pbb pbe pbn pbo pbp pbt pea peb pee pen peo pep pet pn- pna pnb pne pnn pno pnp pnt poa pob poe pon poo pop pot ppa ppb ppe ppn ppo ppp ppt pt- pta ptb pte ptn pto ptp ptt taa tab tae tan tao tap tat tba tbb tbe tbn tbo tbp tbt te- tea teb tee ten teo tep tet tna tnb tne tnn tno tnp tnt to- toa tob toe ton too top tot tpa tpb tpe tpn tpo tpp tpt tta ttb tte ttn tto ttp ttt