-er a-a a-i aaa aad aae aai aap aar aax ad- ada add ade adi adp adr adx aea aed aee aei aep aer aex ai- aia aid aie aii aip air aix ap- apa apd ape api app apr apx ar- ara ard are ari arp arr arx ax- axa axe axi axp axr axx daa dad dae dai dap dar dax dda ddd dde ddi ddp ddr ddx de- dea ded dee dei dep der dex di- dia did die dii dip dir dix dpa dpd dpe dpi dpp dpr dra drd dre dri drp drr drx dxd dxi dxp dxr dxx eaa ead eae eai eap ear eax ed- eda edd ede edi edp edr edx eea eed eee eep eer eex eia eid eie eii eip eir eix ep- epa epd epe epi epp epr epx era erd ere eri erp err ex- exa exd exe exi exp exr exx i-d ia- iaa iad iae iai iap iar ida idd ide idi idp idr idx ie- iea ied iee iei iep ier iex iia iid iie iii iip iir iix ipa ipd ipe ipi ipp ipr ipx ir- ira ird ire iri irp irr irx ixe ixi p-p paa pad pae pai pap par pax pda pdd pde pdi pdp pdr pdx pea ped pee pei pep per pex pia pid pie pii pip pir pix ppa ppd ppe ppi ppp ppr ppx pra prd pre pri prp prr prx pxe pxr ra- raa rad rae rai rap rar rax rda rdd rde rdi rdp rdr rdx re- rea red ree rei rep rer rex ria rid rie rii rip rir rix rpa rpd rpe rpi rpp rpr rpx rra rrd rri rrp rrr rxp rxr xaa xad xap xar xda xde xdi xdr xed xee xep xer xex xia xie xii xix xpa xpd xpe xpp xrd xrx xxi xxp xxx