-er a-a a-b aaa aab aae aah aan aao aap aar ab- aba abb abe abh abn abo abp abr aea aeb aee aeh aen aeo aep aer aha ahb ahe ahh ahn aho ahp ahr an- ana anb ane anh ann ano anp anr aoa aob aoe aoh aon aoo aop aor ap- apa apb ape aph apn apo app apr ar- ara arb are arh arn aro arp arr b-p baa bab bae bah ban bao bap bar bba bbb bbe bbh bbn bbo bbp bbr be- bea beb bee beh ben beo bep ber bha bhb bhe bhh bho bhp bhr bna bnb bne bnn bno bnp bnr boa bob boe boh bon boo bop bor bpa bpb bpe bph bpn bpo bpp bpr bra brb bre brh brn bro brp brr eaa eab eae eah ean eao eap ear eba ebb ebe ebh ebn ebo ebp ebr eea eeb eee een eeo eep eer eha ehb ehe ehh ehn eho ehp ehr en- ena enb ene enh enn eno enp enr eo- eoa eob eoe eoh eon eoo eop eor ep- epa epb epe eph epn epo epp epr era erb ere erh ern ero erp err haa hab hae hah han hao hap har hba hbb hbe hbh hbn hbo hbp hbr he- hea heb hee heh hen heo hep her hha hhb hhe hhh hhn hho hhp hhr hna hnb hne hnh hnn hno hoa hob hoe hoh hon hoo hop hor hpa hpb hpe hph hpn hpo hpp hpr hr- hra hrb hre hrh hrn hro hrp hrr naa nab nae nah nan nao nap nar nba nbb nbe nbn nbo nbp nbr ne- nea neb nee neh nen neo nep ner nha nhb nhe nhh nhn nhp nhr nna nnb nne nnh nnn nno nnp no- noa nob noe noh non noo nop nor npa npb npe nph npn npo npp npr nra nrb nre nrn nro nrp nrr oaa oab oae oah oan oao oap oar ob- oba obb obe obh obn obo obp obr oea oeb oee oeh oen oeo oep oer oha ohe ohh ohn oho ohp ohr on- ona onb one onh onn ono onp onr oo- ooa oob ooh oon ooo oop oor op- opa opb ope oph opn opo opp opr or- ora orb ore orh orn oro orp orr p-p paa pab pae pah pan pao pap par pba pbb pbe pbn pbo pbp pbr pea peb pee peh pen peo pep per pha phb phe phn pho php phr pn- pna pnb pne pnh pnn pno pnp pnr poa pob poe poh pon poo pop por ppa ppb ppe pph ppn ppo ppp ppr pra prb pre prh prn pro prp prr ra- raa rab rae rah ran rao rap rar rba rbb rbe rbh rbn rbo rbp rbr re- rea reb ree reh ren reo rep rer rh- rha rhb rhe rhh rhn rho rhp rhr rna rnb rnh rnn rno rnp rnr roa rob roe roh ron roo rop ror rpa rpb rpe rph rpn rpo rpp rpr rra rrb rrh rrn rrp rrr