-er a-a a-b a-i aaa aab aae aag aai aar aav ab- aba abb abe abg abi abr abv aea aeb aee aeg aei aer aev ag- aga agb age agg agi agr agv ai- aia aib aie aig aii air aiv ar- ara arb are arg ari arr arv av- ava avb ave avg avi avr baa bab bae bag bai bar bav bba bbb bbe bbg bbi bbr be- bea beb bee beg bei ber bev bga bgb bge bgg bgi bgr bgv bi- bia bib bie big bii bir biv bra brb bre brg bri brr brv bva bvb bve bvg bvi bvr bvv eaa eab eae eag eai ear eav eba ebb ebe ebg ebi ebr ebv eea eeb eee eeg eer eev ega egb ege egg egi egr eia eib eie eig eii eir eiv era erb ere erg eri err erv eva evb eve evg evi evr evv gaa gab gae gag gai gar gav gba gbe gbg gbi gbr gbv ge- gea geb gee geg gei ger gev gga ggb ggg ggi ggr ggv gia gib gie gig gii gir giv gra grb gre grg gri grr grv gva gvb gve gvg gvi gvr i-v ia- iaa iab iae iag iai iar iav iba ibb ibe ibg ibi ibr ibv ie- iea iee ieg iei ier iev iga igb ige igg igi igr iia iib iie iii iir ir- ira irb ire irg iri irr irv iva ivb ive ivg ivi ivr ivv ra- raa rab rae rag rai rar rav rba rbb rbe rbg rbi rbr re- rea reb ree reg rei rer rev rga rgb rge rgg rgi rgr rgv ria rib rie rig rii rir riv rra rrb rrg rri rrr rva rvb rve rvg rvi rvr rvv v-a v-e vaa vab vae vag vai var vav vba vbg vbi vbr vbv vea veb vee veg vei ver vga vgg vgr vi- via vib vie vig vii vir viv vra vrb vre vrg vri vrr vva vvb vvg vvi vvr vvv