-er a-a aaa aad aae aaf aak aap aar aax ad- ada add ade adf adk adp adr adx aea aed aee aef aek aep aer aex af- afa afd afe aff afk afp afr afx aka akd ake akk akp akr ap- apa apd ape apf apk app apr apx ar- ara ard are arf ark arp arr arx ax- axa axe axk axp axr axx daa dad dae daf dak dap dar dax dda ddd dde ddf ddk ddp ddr ddx de- dea ded dee def dek dep der dex dfa dfd dfe dff dfk dfp dfr dfx dka dke dkk dkp dkr dkx dpa dpd dpe dpf dpk dpp dpr dra drd dre drk drp drr drx dxd dxp dxr dxx eaa ead eae eaf eak eap ear eax ed- eda edd ede edf edk edp edr edx eea eed eee eef eek eep eer eex ef- efa efd efe eff efp efr efx eka ekd eke ekf ekp ekr ep- epa epd epe epf epp epr epx era erd ere erf erk erp err ex- exa exd exe exp exr exx faa fad fae faf fak fap far fax fda fdd fde fdf fdk fdp fdr fdx fea fed fee fef fek fep fer fex ffa ffd ffe fff ffk ffp ffr ffx fka fkf fkk fkp fpa fpd fpe fpk fpp fpr fpx fra frd fre frf frk frp frr fxe fxp fxr fxx ka- kaa kad kae kaf kak kap kar kax kda kde kdf kdk kdp kdr kdx ke- kea ked kee kef kek kep ker kex kfa kfd kff kfx kke kkk kkp kkr kpa kpd kpe kpf kpk kpp kpr kra krd krf krk krp krr p-p paa pad pae paf pak pap par pax pda pdd pde pdf pdk pdp pdr pdx pea ped pee pef pek pep per pex pfa pfd pfe pff pfk pfp pfr pfx pka pkd pke pkf pkp pkr ppa ppd ppe ppf ppk ppp ppr ppx pra prd pre prf prk prp prr prx pxe pxk pxr ra- raa rad rae raf rak rap rar rax rda rdd rde rdf rdp rdr rdx re- rea red ree ref rek rep rer rex rfa rfd rfe rff rfk rfp rfr rke rkf rkk rkp rpa rpd rpe rpf rpk rpp rpr rpx rra rrd rrf rrk rrp rrr rxp rxr xaa xad xaf xak xap xar xda xde xdf xdk xdr xed xee xep xer xex xfa xfe xfx xke xpa xpd xpe xpf xpp xrd xrf xrx xxp xxx