-er a-a a-b a-i aaa aab aae aag aai aao aap aar aav ab- aba abb abe abg abi abo abp abr abv aea aeb aee aeg aei aeo aep aer aev ag- aga agb age agg agi ago agp agr agv ai- aia aib aie aig aii aio aip air aiv aoa aob aoe aog aoi aoo aop aor aov ap- apa apb ape apg api apo app apr apv ar- ara arb are arg ari aro arp arr arv av- ava avb ave avg avi avo avp avr b-p baa bab bae bag bai bao bap bar bav bba bbb bbe bbg bbi bbo bbp bbr be- bea beb bee beg bei beo bep ber bev bga bgb bge bgg bgi bgo bgp bgr bgv bi- bia bib bie big bii bio bip bir biv boa bob boe bog boi boo bop bor bov bpa bpb bpe bpg bpi bpo bpp bpr bpv bra brb bre brg bri bro brp brr brv bva bvb bve bvg bvi bvo bvp bvr bvv eaa eab eae eag eai eao eap ear eav eba ebb ebe ebg ebi ebo ebp ebr ebv eea eeb eee eeg eeo eep eer eev ega egb ege egg egi ego egp egr eia eib eie eig eii eio eip eir eiv eo- eoa eob eoe eog eoi eoo eop eor ep- epa epb epe epg epi epo epp epr era erb ere erg eri ero erp err erv eva evb eve evg evi evo evp evr evv g-p gaa gab gae gag gai gao gap gar gav gba gbe gbg gbi gbo gbp gbr gbv ge- gea geb gee geg gei geo gep ger gev gga ggb ggg ggi ggo ggp ggr ggv gia gib gie gig gii gio gip gir giv goa gob goe gog goi goo gop gor gov gpa gpb gpe gpg gpi gpo gpp gpr gra grb gre grg gri gro grp grr grv gva gvb gve gvg gvi gvo gvp gvr i-v ia- iaa iab iae iag iai iao iap iar iav iba ibb ibe ibg ibi ibo ibp ibr ibv ie- iea iee ieg iei iep ier iev iga igb ige igg igi igo igp igr iia iib iie iii iio iip iir io- ioa iob ioe iog ioi ioo iop ior iov ipa ipb ipe ipg ipi ipo ipp ipr ipv ir- ira irb ire irg iri iro irp irr irv iva ivb ive ivg ivi ivo ivp ivr ivv o-i oaa oab oae oag oai oao oap oar oav ob- oba obb obe obg obi obo obp obr obv oea oeb oee oeg oei oeo oep oer oga oge ogg ogi ogo ogp oia oib oie oii oio oip oir oiv oo- ooa oob oog ooi ooo oop oor oov op- opa opb ope opg opi opo opp opr opv or- ora orb ore org ori oro orp orr orv ov- ova ovb ove ovi ovo ovp ovv p-p paa pab pae pag pai pao pap par pav pba pbb pbe pbg pbi pbo pbp pbr pea peb pee peg pei peo pep per pev pga pgb pge pgg pgi pgo pgp pgr pgv pia pib pie pig pii pio pip pir piv poa pob poe pog poi poo pop por pov ppa ppb ppe ppg ppi ppo ppp ppr ppv pra prb pre prg pri pro prp prr prv pva pvb pve pvg pvi pvo pvp pvr pvv ra- raa rab rae rag rai rao rap rar rav rba rbb rbe rbg rbi rbo rbp rbr re- rea reb ree reg rei reo rep rer rev rga rgb rge rgg rgi rgo rgp rgr rgv ria rib rie rig rii rio rip rir riv roa rob roe rog roi roo rop ror rov rpa rpb rpe rpg rpi rpo rpp rpr rpv rra rrb rrg rri rrp rrr rva rvb rve rvg rvi rvo rvp rvr rvv v-a v-e vaa vab vae vag vai vao vap var vav vba vbg vbi vbo vbr vbv vea veb vee veg vei veo vep ver vga vgg vgo vgp vgr vi- via vib vie vig vii vio vip vir viv voa vob voe vog voi voo vop vor vov vpa vpb vpe vpg vpi vpo vpp vpr vra vrb vre vrg vri vrp vrr vva vvb vvg vvi vvo vvr vvv