a-a a-b aaa aab aae aag aan aao aap ab- aba abb abe abg abn abo abp aea aeb aee aeg aen aeo aep ag- aga agb age agg agn ago agp an- ana anb ane ang ann ano anp aoa aob aoe aog aon aoo aop ap- apa apb ape apg apn apo app b-p baa bab bae bag ban bao bap bba bbb bbe bbg bbn bbo bbp be- bea beb bee beg ben beo bep bga bgb bge bgg bgn bgo bgp bna bnb bne bng bnn bno bnp boa bob boe bog bon boo bop bpa bpb bpe bpg bpn bpo bpp eaa eab eae eag ean eao eap eba ebb ebe ebg ebn ebo ebp eea eeb eee eeg een eeo eep ega egb ege egg egn ego egp en- ena enb ene eng enn eno enp eo- eoa eob eoe eog eon eoo eop ep- epa epb epe epg epn epo epp g-p gaa gab gae gag gan gao gap gba gbe gbg gbn gbo gbp ge- gea geb gee geg gen geo gep gga ggb ggg ggn ggo ggp gna gnb gne gnn gno gnp goa gob goe gog gon goo gop gpa gpb gpe gpg gpn gpo gpp naa nab nae nag nan nao nap nba nbb nbe nbg nbn nbo nbp ne- nea neb nee neg nen neo nep nga ngb nge ngg ngn ngo ngp nna nnb nne nng nnn nno nnp no- noa nob noe nog non noo nop npa npb npe npg npn npo npp oaa oab oae oag oan oao oap ob- oba obb obe obg obn obo obp oea oeb oee oeg oen oeo oep oga oge ogg ogn ogo ogp on- ona onb one ong onn ono onp oo- ooa oob oog oon ooo oop op- opa opb ope opg opn opo opp p-p paa pab pae pag pan pao pap pba pbb pbe pbg pbn pbo pbp pea peb pee peg pen peo pep pga pgb pge pgg pgn pgo pgp pn- pna pnb pne png pnn pno pnp poa pob poe pog pon poo pop ppa ppb ppe ppg ppn ppo ppp