oam oao oap oar ob- oba obb obc obd obe obf obl obm obo obp obr oc- oca ocb occ ocd ocf ocl ocm oco ocp ocr oda odb odc odd ode odf odl odm odo odp odr oea oeb oec oed oee oef oel oem oeo oep oer of- ofa ofb ofc ofd ofe off ofl ofm ofo ofp ofr ola olb olc old ole olf oll olm olo olp om- oma omb omc omd ome omf oml omm omo omp omr oo- ooa oob ooc ood oof ool oom ooo oop oor op- opa opb opc opd ope opf opl opm opo opp opr or- ora orb orc ord ore orf orl orm oro orp orr p-p paa pab pac pad pae paf pal pam pao pap par pba pbb pbc pbd pbe pbf pbl pbm pbo pbp pbr pca pcb pcc pcd pce pcf pcl pcm pco pcp pcr pda pdb pdc pdd pde pdf pdl pdm pdo pdp pdr pea peb pec ped pee pef pel pem peo pep per pfa pfb pfc pfd pfe pff pfl pfm pfo pfp pfr pla plb plc pld ple plf pll plm plo plp plr pma pmb pmc pmd pme pmf pml pmm pmo pmp pmr poa pob poc pod poe pof pol pom poo pop por ppa ppb ppc ppd ppe ppf ppl ppm ppo ppp ppr pra prb prc prd pre prf prl prm pro prp prr ra- raa rab rac rad rae raf ral ram rao rap rar rba rbb rbc rbd rbe rbf rbl rbm rbo rbp rbr rca rcb rcc rcd rce rcf rcl rcm rco rcp rcr rda rdb rdc rdd rde rdf rdl rdm rdo rdp rdr re- rea reb rec red ree ref rel rem reo rep rer rfa rfb rfc rfd rfe rff rfl rfm rfo rfp rfr rla rlc rld rle rlf rll rlm rlo rlp rlr rma rmb rmc rmd rme rmf rml rmm rmo rmp rmr roa rob roc rod roe rof rol rom roo rop ror rpa rpb rpc rpd rpe rpf rpl rpm rpo rpp rpr rra rrb rrc rrd rrf rrl rrm rrp rrr