-er a-a a-b a-i a-t aaa aab aae aai aao aap aar aat aav ab- aba abb abe abi abo abp abr abt abv aea aeb aee aei aeo aep aer aet aev ai- aia aib aie aii aio aip air ait aiv aoa aob aoe aoi aoo aop aor aot aov ap- apa apb ape api apo app apr apt apv ar- ara arb are ari aro arp arr art arv at- ata atb ate ati ato atp atr att atv av- ava avb ave avi avo avp avr avt b-p baa bab bae bai bao bap bar bat bav bba bbb bbe bbi bbo bbp bbr bbt be- bea beb bee bei beo bep ber bet bev bi- bia bib bie bii bio bip bir bit biv boa bob boe boi boo bop bor bot bov bpa bpb bpe bpi bpo bpp bpr bpt bpv bra brb bre bri bro brp brr brt brv bta btb bte bti bto btp btr btt btv bva bvb bve bvi bvo bvp bvr bvt bvv eaa eab eae eai eao eap ear eat eav eba ebb ebe ebi ebo ebp ebr ebt ebv eea eeb eee eeo eep eer eet eev eia eib eie eii eio eip eir eit eiv eo- eoa eob eoe eoi eoo eop eor eot ep- epa epb epe epi epo epp epr ept era erb ere eri ero erp err ert erv eta etb ete eti eto etp etr ett etv eva evb eve evi evo evp evr evt evv i-v ia- iaa iab iae iai iao iap iar iat iav iba ibb ibe ibi ibo ibp ibr ibt ibv ie- iea iee iei iep ier iet iev iia iib iie iii iio iip iir iit io- ioa iob ioe ioi ioo iop ior iot iov ipa ipb ipe ipi ipo ipp ipr ipt ipv ir- ira irb ire iri iro irp irr irt irv ita itb ite iti ito itp itt itv iva ivb ive ivi ivo ivp ivr ivt ivv o-i oaa oab oae oai oao oap oar oat oav ob- oba obb obe obi obo obp obr obt obv oea oeb oee oei oeo oep oer oet oia oib oie oii oio oip oir oit oiv oo- ooa oob ooi ooo oop oor oot oov op- opa opb ope opi opo opp opr opt opv or- ora orb ore ori oro orp orr ort orv ot- ota otb ote oti oto otp otr ott otv ov- ova ovb ove ovi ovo ovp ovv p-p paa pab pae pai pao pap par pat pav pba pbb pbe pbi pbo pbp pbr pbt pea peb pee pei peo pep per pet pev pia pib pie pii pio pip pir pit piv poa pob poe poi poo pop por pot pov ppa ppb ppe ppi ppo ppp ppr ppt ppv pra prb pre pri pro prp prr prt prv pt- pta ptb pte pti pto ptp ptr ptt ptv pva pvb pve pvi pvo pvp pvr pvt pvv ra- raa rab rae rai rao rap rar rat rav rba rbb rbe rbi rbo rbp rbr rbt re- rea reb ree rei reo rep rer ret rev ria rib rie rii rio rip rir rit riv roa rob roe roi roo rop ror rot rov rpa rpb rpe rpi rpo rpp rpr rpt rpv rra rrb rri rrp rrr rrt rta rtb rte rti rto rtp rtr rtt rtv rva rvb rve rvi rvo rvp rvr rvt rvv taa tab tae tai tao tap tar tat tav tba tbb tbe tbi tbo tbp tbr tbt tbv te- tea teb tee tei teo tep ter tet tev tia tib tie tii tio tip tir tit tiv to- toa tob toe toi too top tor tot tov tpa tpb tpe tpi tpo tpp tpr tpt tpv tra trb tre tri tro trp trr trt trv tta ttb tte tti tto ttp ttr ttt ttv tva tvb tve tvi tvo tvp tvr tvt v-a v-e vaa vab vae vai vao vap var vat vav vba vbi vbo vbr vbv vea veb vee vei veo vep ver vet vi- via vib vie vii vio vip vir vit viv voa vob voe voi voo vop vor vot vov vpa vpb vpe vpi vpo vpp vpr vpt vra vrb vre vri vrp vrr vrt vta vtb vte vti vto vtr vtt vtv vva vvb vvi vvo vvr vvt vvv