-er a-a a-b a-i aaa aab aad aae aai aan aar aav ab- aba abb abd abe abi abn abr abv ad- ada adb add ade adi adn adr adv aea aeb aed aee aei aen aer aev ai- aia aib aid aie aii ain air aiv an- ana anb and ane ani ann anr anv ar- ara arb ard are ari arn arr arv av- ava avb avd ave avi avn avr baa bab bad bae bai ban bar bav bba bbb bbd bbe bbi bbn bbr bda bdb bdd bde bdi bdr bdv be- bea beb bed bee bei ben ber bev bi- bia bib bid bie bii bin bir biv bna bnb bnd bne bni bnn bnr bnv bra brb brd bre bri brn brr brv bva bvb bvd bve bvi bvn bvr bvv daa dab dad dae dai dan dar dav dba dbb dbd dbe dbi dbn dbr dbv dda ddb ddd dde ddi ddn ddr de- dea deb ded dee dei den der dev di- dia dib did die dii din dir div dna dnb dnd dne dni dnn dnr dra drb drd dre dri drn drr drv dva dvb dvd dve dvi dvn dvr eaa eab ead eae eai ean ear eav eba ebb ebd ebe ebi ebn ebr ebv ed- eda edb edd ede edi edn edr eea eeb eed eee een eer eev eia eib eid eie eii ein eir eiv en- ena enb end ene eni enn enr env era erb erd ere eri ern err erv eva evb evd eve evi evn evr evv i-d i-v ia- iaa iab iad iae iai ian iar iav iba ibb ibd ibe ibi ibn ibr ibv ida idb idd ide idi idn idr idv ie- iea ied iee iei ien ier iev iia iib iid iie iii iin iir in- ina inb ind ine ini inn inr inv ir- ira irb ird ire iri irn irr irv iva ivb ivd ive ivi ivr ivv n-i naa nab nad nae nai nan nar nav nba nbb nbd nbe nbi nbn nbr nbv nda ndb ndd nde ndi ndn ndr ndv ne- nea neb ned nee nei nen ner nev nia nib nid nie nii nin nir niv nna nnb nne nni nnn nnv nra nrb nrd nre nri nrn nrr nrv nva nvb nvd nve nvi nvn nvv ra- raa rab rad rae rai ran rar rav rba rbb rbd rbe rbi rbn rbr rda rdb rdd rde rdi rdn rdr rdv re- rea reb red ree rei ren rer rev ria rib rid rie rii rin rir riv rna rnb rnd rni rnn rnr rnv rra rrb rrd rri rrn rrr rva rvb rvd rve rvi rvn rvr rvv v-a v-e vaa vab vad vae vai van var vav vba vbd vbi vbr vbv vdb vdd vde vdi vdr vdv vea veb ved vee vei ven ver vi- via vib vid vie vii vin vir viv vn- vna vnd vni vnr vnv vra vrb vrd vre vri vrn vrr vva vvb vvi vvr vvv