-er eee eef eek eer eet ef- efe eff efi efr eft eie eif eii eik eir eit eke ekf eki ekr ekt ere erf eri erk err ert ete etf eti etk etr ett fee fef fei fek fer fet ffe fff ffi ffk ffr fft fie fif fii fik fir fit fkf fki fkk fkt fre frf fri frk frr frt fte ftf fti ftk ftr ftt i-f ie- iee ief iei iek ier iet ife iff ifi ifr ift iie iif iii iir iit ike ikf iki ikk ikr ikt ir- ire irf iri irk irr irt ite itf iti itk itt k-t ke- kee kef kei kek ker ket kff kfi kie kif kii kik kir kit kke kki kkk kkr kkt krf kri krk krr krt kte ktf ktk ktr ktt re- ree ref rei rek rer ret rfe rff rfi rfk rfr rft rie rif rii rik rir rit rke rkf rkk rkt rrf rri rrk rrr rrt rte rtf rti rtk rtr rtt te- tee tef tei tek ter tet tfe tff tfi tfk tfr tft tie tif tii tik tir tit tke tkk tkr tkt tre trf tri trk trr trt tte ttf tti ttk ttr ttt