-er ddd dde ddi ddp ddr ddt de- ded dee dei dep der det di- did die dii dip dir dit dpd dpe dpi dpp dpr dpt drd dre dri drp drr drt dtd dte dti dtp dtr dtt ed- edd ede edi edp edr edt eed eee eep eer eet eid eie eii eip eir eit ep- epd epe epi epp epr ept erd ere eri erp err ert etd ete eti etp etr ett i-d idd ide idi idp idr idt ie- ied iee iei iep ier iet iid iie iii iip iir iit ipd ipe ipi ipp ipr ipt ir- ird ire iri irp irr irt itd ite iti itp itt p-p pdd pde pdi pdp pdr pdt ped pee pei pep per pet pid pie pii pip pir pit ppd ppe ppi ppp ppr ppt prd pre pri prp prr prt pt- ptd pte pti ptp ptr ptt rdd rde rdi rdp rdr rdt re- red ree rei rep rer ret rid rie rii rip rir rit rpd rpe rpi rpp rpr rpt rrd rri rrp rrr rrt rtd rte rti rtp rtr rtt tdd tde tdi tdp tdr tdt te- ted tee tei tep ter tet tid tie tii tip tir tit tpd tpe tpi tpp tpr tpt trd tre tri trp trr trt ttd tte tti ttp ttr ttt