-er a-a a-i aaa aad aae aai aak aap aar aax ad- ada add ade adi adk adp adr adx aea aed aee aei aek aep aer aex ai- aia aid aie aii aik aip air aix aka akd ake aki akk akp akr ap- apa apd ape api apk app apr apx ar- ara ard are ari ark arp arr arx ax- axa axe axi axk axp axr axx daa dad dae dai dak dap dar dax dda ddd dde ddi ddk ddp ddr ddx de- dea ded dee dei dek dep der dex di- dia did die dii dik dip dir dix dka dke dki dkk dkp dkr dkx dpa dpd dpe dpi dpk dpp dpr dra drd dre dri drk drp drr drx dxd dxi dxp dxr dxx eaa ead eae eai eak eap ear eax ed- eda edd ede edi edk edp edr edx eea eed eee eek eep eer eex eia eid eie eii eik eip eir eix eka ekd eke eki ekp ekr ep- epa epd epe epi epp epr epx era erd ere eri erk erp err ex- exa exd exe exi exp exr exx i-d ia- iaa iad iae iai iap iar ida idd ide idi idk idp idr idx ie- iea ied iee iei iek iep ier iex iia iid iie iii iip iir iix ika ike iki ikk ikr ikx ipa ipd ipe ipi ipp ipr ipx ir- ira ird ire iri irk irp irr irx ixe ixi ka- kaa kad kae kai kak kap kar kax kda kde kdk kdp kdr kdx ke- kea ked kee kei kek kep ker kex kia kid kie kii kik kip kir kix kke kki kkk kkp kkr kpa kpd kpe kpi kpk kpp kpr kra krd kri krk krp krr p-p paa pad pae pai pak pap par pax pda pdd pde pdi pdk pdp pdr pdx pea ped pee pei pek pep per pex pia pid pie pii pik pip pir pix pka pkd pke pki pkp pkr ppa ppd ppe ppi ppk ppp ppr ppx pra prd pre pri prk prp prr prx pxe pxk pxr ra- raa rad rae rai rak rap rar rax rda rdd rde rdi rdp rdr rdx re- rea red ree rei rek rep rer rex ria rid rie rii rik rip rir rix rke rkk rkp rpa rpd rpe rpi rpk rpp rpr rpx rra rrd rri rrk rrp rrr rxp rxr xaa xad xak xap xar xda xde xdi xdk xdr xed xee xep xer xex xia xie xii xix xke xpa xpd xpe xpp xrd xrx xxi xxp xxx