-er a-a a-b a-i a-t aaa aab aae aai aap aar aat aav ab- aba abb abe abi abp abr abt abv aea aeb aee aei aep aer aet aev ai- aia aib aie aii aip air ait aiv ap- apa apb ape api app apr apt apv ar- ara arb are ari arp arr art arv at- ata atb ate ati atp atr att atv av- ava avb ave avi avp avr avt b-p baa bab bae bai bap bar bat bav bba bbb bbe bbi bbp bbr bbt be- bea beb bee bei bep ber bet bev bi- bia bib bie bii bip bir bit biv bpa bpb bpe bpi bpp bpr bpt bpv bra brb bre bri brp brr brt brv bta btb bte bti btp btr btt btv bva bvb bve bvi bvp bvr bvt bvv eaa eab eae eai eap ear eat eav eba ebb ebe ebi ebp ebr ebt ebv eea eeb eee eep eer eet eev eia eib eie eii eip eir eit eiv ep- epa epb epe epi epp epr ept era erb ere eri erp err ert erv eta etb ete eti etp etr ett etv eva evb eve evi evp evr evt evv i-v ia- iaa iab iae iai iap iar iat iav iba ibb ibe ibi ibp ibr ibt ibv ie- iea iee iei iep ier iet iev iia iib iie iii iip iir iit ipa ipb ipe ipi ipp ipr ipt ipv ir- ira irb ire iri irp irr irt irv ita itb ite iti itp itt itv iva ivb ive ivi ivp ivr ivt ivv p-p paa pab pae pai pap par pat pav pba pbb pbe pbi pbp pbr pbt pea peb pee pei pep per pet pev pia pib pie pii pip pir pit piv ppa ppb ppe ppi ppp ppr ppt ppv pra prb pre pri prp prr prt prv pt- pta ptb pte pti ptp ptr ptt ptv pva pvb pve pvi pvp pvr pvt pvv ra- raa rab rae rai rap rar rat rav rba rbb rbe rbi rbp rbr rbt re- rea reb ree rei rep rer ret rev ria rib rie rii rip rir rit riv rpa rpb rpe rpi rpp rpr rpt rpv rra rrb rri rrp rrr rrt rta rtb rte rti rtp rtr rtt rtv rva rvb rve rvi rvp rvr rvt rvv taa tab tae tai tap tar tat tav tba tbb tbe tbi tbp tbr tbt tbv te- tea teb tee tei tep ter tet tev tia tib tie tii tip tir tit tiv tpa tpb tpe tpi tpp tpr tpt tpv tra trb tre tri trp trr trt trv tta ttb tte tti ttp ttr ttt ttv tva tvb tve tvi tvp tvr tvt v-a v-e vaa vab vae vai vap var vat vav vba vbi vbr vbv vea veb vee vei vep ver vet vi- via vib vie vii vip vir vit viv vpa vpb vpe vpi vpp vpr vpt vra vrb vre vri vrp vrr vrt vta vtb vte vti vtr vtt vtv vva vvb vvi vvr vvt vvv