obl obo obr obv oc- oca ocb occ ocd ocg oci ocl oco ocr ocv oda odb odc odd ode odg odi odl odo odr odv oea oeb oec oed oee oeg oei oel oeo oer oga ogc ogd oge ogg ogi ogl ogo oia oib oic oid oie oii oil oio oir oiv ola olb olc old ole olg oli oll olo oo- ooa oob ooc ood oog ooi ool ooo oor oov or- ora orb orc ord ore org ori orl oro orr orv ov- ova ovb ovc ovd ove ovi ovl ovo ovv ra- raa rab rac rad rae rag rai ral rao rar rav rba rbb rbc rbd rbe rbg rbi rbl rbo rbr rca rcb rcc rcd rce rcg rci rcl rco rcr rcv rda rdb rdc rdd rde rdg rdi rdl rdo rdr rdv re- rea reb rec red ree reg rei rel reo rer rev rga rgb rgc rgd rge rgg rgi rgo rgr rgv ria rib ric rid rie rig rii ril rio rir riv rla rlc rld rle rlg rli rll rlo rlr roa rob roc rod roe rog roi rol roo ror rov rra rrb rrc rrd rrg rri rrl rrr rva rvb rvc rvd rve rvg rvi rvl rvo rvr rvv v-a v-e vaa vab vac vad vae vag vai val vao var vav vba vbc vbd vbg vbi vbl vbo vbr vbv vca vcc vcd vce vci vcl vco vcr vdb vdc vdd vde vdg vdi vdl vdo vdr vdv vea veb vec ved vee veg vei vel veo ver vga vgc vgg vgl vgo vgr vi- via vib vic vid vie vig vii vil vio vir viv vl- vla vlb vlc vld vle vll vlo vlv voa vob voc vod voe vog voi vol voo vor vov vra vrb vrc vrd vre vrg vri vrr vva vvb vvc vvg vvi vvo vvr vvv