-er a-a a-b a-i a-t aaa aab aad aae aai aar aat aav ab- aba abb abd abe abi abr abt abv ad- ada adb add ade adi adr adt adv aea aeb aed aee aei aer aet aev ai- aia aib aid aie aii air ait aiv ar- ara arb ard are ari arr art arv at- ata atb atd ate ati atr att atv av- ava avb avd ave avi avr avt baa bab bad bae bai bar bat bav bba bbb bbd bbe bbi bbr bbt bda bdb bdd bde bdi bdr bdt bdv be- bea beb bed bee bei ber bet bev bi- bia bib bid bie bii bir bit biv bra brb brd bre bri brr brt brv bta btb btd bte bti btr btt btv bva bvb bvd bve bvi bvr bvt bvv daa dab dad dae dai dar dat dav dba dbb dbd dbe dbi dbr dbt dbv dda ddb ddd dde ddi ddr ddt de- dea deb ded dee dei der det dev di- dia dib did die dii dir dit div dra drb drd dre dri drr drt drv dta dtb dtd dte dti dtr dtt dtv dva dvb dvd dve dvi dvr dvt eaa eab ead eae eai ear eat eav eba ebb ebd ebe ebi ebr ebt ebv ed- eda edb edd ede edi edr edt eea eeb eed eee eer eet eev eia eib eid eie eii eir eit eiv era erb erd ere eri err ert erv eta etb etd ete eti etr ett etv eva evb evd eve evi evr evt evv i-d i-v ia- iaa iab iad iae iai iar iat iav iba ibb ibd ibe ibi ibr ibt ibv ida idb idd ide idi idr idt idv ie- iea ied iee iei ier iet iev iia iib iid iie iii iir iit ir- ira irb ird ire iri irr irt irv ita itb itd ite iti itt itv iva ivb ivd ive ivi ivr ivt ivv ra- raa rab rad rae rai rar rat rav rba rbb rbd rbe rbi rbr rbt rda rdb rdd rde rdi rdr rdt rdv re- rea reb red ree rei rer ret rev ria rib rid rie rii rir rit riv rra rrb rrd rri rrr rrt rta rtb rtd rte rti rtr rtt rtv rva rvb rvd rve rvi rvr rvt rvv taa tab tad tae tai tar tat tav tba tbb tbd tbe tbi tbr tbt tbv tda tdb tdd tde tdi tdr tdt tdv te- tea teb ted tee tei ter tet tev tia tib tid tie tii tir tit tiv tra trb trd tre tri trr trt trv tta ttb ttd tte tti ttr ttt ttv tva tvb tvd tve tvi tvr tvt v-a v-e vaa vab vad vae vai var vat vav vba vbd vbi vbr vbv vdb vdd vde vdi vdr vdt vdv vea veb ved vee vei ver vet vi- via vib vid vie vii vir vit viv vra vrb vrd vre vri vrr vrt vta vtb vte vti vtr vtt vtv vva vvb vvi vvr vvt vvv