-er a-a a-b a-i a-t aaa aab aae aai aan aao aar aat aav ab- aba abb abe abi abn abo abr abt abv aea aeb aee aei aen aeo aer aet aev ai- aia aib aie aii ain aio air ait aiv an- ana anb ane ani ann ano anr ant anv aoa aob aoe aoi aon aoo aor aot aov ar- ara arb are ari arn aro arr art arv at- ata atb ate ati atn ato atr att atv av- ava avb ave avi avn avo avr avt baa bab bae bai ban bao bar bat bav bba bbb bbe bbi bbn bbo bbr bbt be- bea beb bee bei ben beo ber bet bev bi- bia bib bie bii bin bio bir bit biv bna bnb bne bni bnn bno bnr bnt bnv boa bob boe boi bon boo bor bot bov bra brb bre bri brn bro brr brt brv bta btb bte bti btn bto btr btt btv bva bvb bve bvi bvn bvo bvr bvt bvv eaa eab eae eai ean eao ear eat eav eba ebb ebe ebi ebn ebo ebr ebt ebv eea eeb eee een eeo eer eet eev eia eib eie eii ein eio eir eit eiv en- ena enb ene eni enn eno enr ent env eo- eoa eob eoe eoi eon eoo eor eot era erb ere eri ern ero err ert erv eta etb ete eti etn eto etr ett etv eva evb eve evi evn evo evr evt evv i-v ia- iaa iab iae iai ian iao iar iat iav iba ibb ibe ibi ibn ibo ibr ibt ibv ie- iea iee iei ien ier iet iev iia iib iie iii iin iio iir iit in- ina inb ine ini inn ino inr int inv io- ioa iob ioe ioi ion ioo ior iot iov ir- ira irb ire iri irn iro irr irt irv ita itb ite iti itn ito itt itv iva ivb ive ivi ivo ivr ivt ivv n-i naa nab nae nai nan nao nar nat nav nba nbb nbe nbi nbn nbo nbr nbt nbv ne- nea neb nee nei nen neo ner net nev nia nib nie nii nin nio nir nit niv nna nnb nne nni nnn nno nnt nnv no- noa nob noe noi non noo nor not nov nra nrb nre nri nrn nro nrr nrt nrv nta ntb nte nti ntn nto ntr ntt ntv nva nvb nve nvi nvn nvt nvv o-i oaa oab oae oai oan oao oar oat oav ob- oba obb obe obi obn obo obr obt obv oea oeb oee oei oen oeo oer oet oia oib oie oii oin oio oir oit oiv on- ona onb one oni onn ono onr ont oo- ooa oob ooi oon ooo oor oot oov or- ora orb ore ori orn oro orr ort orv ot- ota otb ote oti otn oto otr ott otv ov- ova ovb ove ovi ovo ovv ra- raa rab rae rai ran rao rar rat rav rba rbb rbe rbi rbn rbo rbr rbt re- rea reb ree rei ren reo rer ret rev ria rib rie rii rin rio rir rit riv rna rnb rni rnn rno rnr rnt rnv roa rob roe roi ron roo ror rot rov rra rrb rri rrn rrr rrt rta rtb rte rti rtn rto rtr rtt rtv rva rvb rve rvi rvn rvo rvr rvt rvv taa tab tae tai tan tao tar tat tav tba tbb tbe tbi tbn tbo tbr tbt tbv te- tea teb tee tei ten teo ter tet tev tia tib tie tii tin tio tir tit tiv tna tnb tne tni tnn tno tnr tnt to- toa tob toe toi ton too tor tot tov tra trb tre tri trn tro trr trt trv tta ttb tte tti ttn tto ttr ttt ttv tva tvb tve tvi tvn tvo tvr tvt v-a v-e vaa vab vae vai van vao var vat vav vba vbi vbo vbr vbv vea veb vee vei ven veo ver vet vi- via vib vie vii vin vio vir vit viv vn- vna vni vno vnr vnv voa vob voe voi von voo vor vot vov vra vrb vre vri vrn vrr vrt vta vtb vte vti vto vtr vtt vtv vva vvb vvi vvo vvr vvt vvv