-er a-a a-b aaa aab aae aag aah aao aap aar ab- aba abb abe abg abh abo abp abr aea aeb aee aeg aeh aeo aep aer ag- aga agb age agg agh ago agp agr aha ahb ahe ahg ahh aho ahp ahr aoa aob aoe aog aoh aoo aop aor ap- apa apb ape apg aph apo app apr ar- ara arb are arg arh aro arp arr b-p baa bab bae bag bah bao bap bar bba bbb bbe bbg bbh bbo bbp bbr be- bea beb bee beg beh beo bep ber bga bgb bge bgg bgh bgo bgp bgr bha bhb bhe bhg bhh bho bhp bhr boa bob boe bog boh boo bop bor bpa bpb bpe bpg bph bpo bpp bpr bra brb bre brg brh bro brp brr eaa eab eae eag eah eao eap ear eba ebb ebe ebg ebh ebo ebp ebr eea eeb eee eeg eeo eep eer ega egb ege egg egh ego egp egr eha ehb ehe ehg ehh eho ehp ehr eo- eoa eob eoe eog eoh eoo eop eor ep- epa epb epe epg eph epo epp epr era erb ere erg erh ero erp err g-p gaa gab gae gag gah gao gap gar gba gbe gbg gbh gbo gbp gbr ge- gea geb gee geg geh geo gep ger gga ggb ggg ggh ggo ggp ggr gha ghb ghe ghg ghh gho ghp ghr goa gob goe gog goh goo gop gor gpa gpb gpe gpg gph gpo gpp gpr gra grb gre grg grh gro grp grr haa hab hae hag hah hao hap har hba hbb hbe hbg hbh hbo hbp hbr he- hea heb hee heg heh heo hep her hga hgb hge hgg hgh hgo hgp hgr hha hhb hhe hhg hhh hho hhp hhr hoa hob hoe hog hoh hoo hop hor hpa hpb hpe hpg hph hpo hpp hpr hr- hra hrb hre hrg hrh hro hrp hrr oaa oab oae oag oah oao oap oar ob- oba obb obe obg obh obo obp obr oea oeb oee oeg oeh oeo oep oer oga oge ogg ogh ogo ogp oha ohe ohg ohh oho ohp ohr oo- ooa oob oog ooh ooo oop oor op- opa opb ope opg oph opo opp opr or- ora orb ore org orh oro orp orr p-p paa pab pae pag pah pao pap par pba pbb pbe pbg pbo pbp pbr pea peb pee peg peh peo pep per pga pgb pge pgg pgh pgo pgp pgr pha phb phe phg pho php phr poa pob poe pog poh poo pop por ppa ppb ppe ppg pph ppo ppp ppr pra prb pre prg prh pro prp prr ra- raa rab rae rag rah rao rap rar rba rbb rbe rbg rbh rbo rbp rbr re- rea reb ree reg reh reo rep rer rga rgb rge rgg rgh rgo rgp rgr rh- rha rhb rhe rhg rhh rho rhp rhr roa rob roe rog roh roo rop ror rpa rpb rpe rpg rph rpo rpp rpr rra rrb rrg rrh rrp rrr