-er a-a a-t a-z aaa aad aae aar aat aaz ad- ada add ade adr adt adz aea aed aee aer aet aez ar- ara ard are arr art arz at- ata atd ate atr att atz az- aza azd aze azt azz daa dad dae dar dat daz dda ddd dde ddr ddt ddz de- dea ded dee der det dez dra drd dre drr drt drz dta dtd dte dtr dtt dtz dza dzd dze dzr eaa ead eae ear eat eaz ed- eda edd ede edr edt eea eed eee eer eet era erd ere err ert erz eta etd ete etr ett etz eze ezr ezz ra- raa rad rae rar rat raz rda rdd rde rdr rdt re- rea red ree rer ret rez rra rrd rrr rrt rta rtd rte rtr rtt rtz rza rze taa tad tae tar tat taz tda tdd tde tdr tdt te- tea ted tee ter tet tez tra trd tre trr trt trz tta ttd tte ttr ttt tza tzd tze zaa zad zar zat zaz zdt zea zed zee zer zet zez zta zte ztr zzr zzt zzz