-er a-a a-i a-t aaa aad aae aai aar aat aax ad- ada add ade adi adr adt adx aea aed aee aei aer aet aex ai- aia aid aie aii air ait aix ar- ara ard are ari arr art arx at- ata atd ate ati atr att atx ax- axa axe axi axr axt axx daa dad dae dai dar dat dax dda ddd dde ddi ddr ddt ddx de- dea ded dee dei der det dex di- dia did die dii dir dit dix dra drd dre dri drr drt drx dta dtd dte dti dtr dtt dtx dxd dxi dxr dxt dxx eaa ead eae eai ear eat eax ed- eda edd ede edi edr edt edx eea eed eee eer eet eex eia eid eie eii eir eit eix era erd ere eri err ert eta etd ete eti etr ett etx ex- exa exd exe exi exr ext exx i-d ia- iaa iad iae iai iar iat ida idd ide idi idr idt idx ie- iea ied iee iei ier iet iex iia iid iie iii iir iit iix ir- ira ird ire iri irr irt irx ita itd ite iti itt itx ixe ixi ra- raa rad rae rai rar rat rax rda rdd rde rdi rdr rdt rdx re- rea red ree rei rer ret rex ria rid rie rii rir rit rix rra rrd rri rrr rrt rta rtd rte rti rtr rtt rtx rxr t-x taa tad tae tai tar tat tax tda tdd tde tdi tdr tdt tdx te- tea ted tee tei ter tet tex tia tid tie tii tir tit tix tra trd tre tri trr trt trx tta ttd tte tti ttr ttt ttx txe txi txt xaa xad xar xat xda xde xdi xdr xdt xed xee xer xet xex xia xie xii xit xix xrd xrt xrx xti xtr xtx xxi xxx