-er a-a a-i aaa aad aae aai aar aax ad- ada add ade adi adr adx aea aed aee aei aer aex ai- aia aid aie aii air aix ar- ara ard are ari arr arx ax- axa axe axi axr axx daa dad dae dai dar dax dda ddd dde ddi ddr ddx de- dea ded dee dei der dex di- dia did die dii dir dix dra drd dre dri drr drx dxd dxi dxr dxx eaa ead eae eai ear eax ed- eda edd ede edi edr edx eea eed eee eer eex eia eid eie eii eir eix era erd ere eri err ex- exa exd exe exi exr exx i-d ia- iaa iad iae iai iar ida idd ide idi idr idx ie- iea ied iee iei ier iex iia iid iie iii iir iix ir- ira ird ire iri irr irx ixe ixi ra- raa rad rae rai rar rax rda rdd rde rdi rdr rdx re- rea red ree rei rer rex ria rid rie rii rir rix rra rrd rri rrr rxr xaa xad xar xda xde xdi xdr xed xee xer xex xia xie xii xix xrd xrx xxi xxx