-er a-a a-t aaa aad aae aak aar aat aax ad- ada add ade adk adr adt adx aea aed aee aek aer aet aex aka akd ake akk akr ar- ara ard are ark arr art arx at- ata atd ate atr att atx ax- axa axe axk axr axt axx daa dad dae dak dar dat dax dda ddd dde ddk ddr ddt ddx de- dea ded dee dek der det dex dka dke dkk dkr dkt dkx dra drd dre drk drr drt drx dta dtd dte dtk dtr dtt dtx dxd dxr dxt dxx eaa ead eae eak ear eat eax ed- eda edd ede edk edr edt edx eea eed eee eek eer eet eex eka ekd eke ekr ekt era erd ere erk err ert eta etd ete etk etr ett etx ex- exa exd exe exr ext exx k-t ka- kaa kad kae kak kar kat kax kda kde kdk kdr kdt kdx ke- kea ked kee kek ker ket kex kke kkk kkr kkt kra krd krk krr krt kta kte ktk ktr ktt ra- raa rad rae rak rar rat rax rda rdd rde rdr rdt rdx re- rea red ree rek rer ret rex rke rkk rkt rra rrd rrk rrr rrt rta rtd rte rtk rtr rtt rtx rxr t-x taa tad tae tak tar tat tax tda tdd tde tdk tdr tdt tdx te- tea ted tee tek ter tet tex tka tke tkk tkr tkt tra trd tre trk trr trt trx tta ttd tte ttk ttr ttt ttx txe txk txt xaa xad xak xar xat xda xde xdk xdr xdt xed xee xer xet xex xke xrd xrt xrx xtr xtx xxx