pdo pdp pdr pdt pea ped pee pef peh pei pel peo pep per pet pfa pfd pfe pff pfi pfl pfo pfp pfr pft pha phd phe phf phi phl pho php phr pht pia pid pie pif pih pii pil pio pip pir pit pla pld ple plf plh pli pll plo plp plr plt poa pod poe pof poh poi pol poo pop por pot ppa ppd ppe ppf pph ppi ppl ppo ppp ppr ppt pra prd pre prf prh pri prl pro prp prr prt pt- pta ptd pte ptf pth pti ptl pto ptp ptr ptt ra- raa rad rae raf rah rai ral rao rap rar rat rda rdd rde rdf rdh rdi rdl rdo rdp rdr rdt re- rea red ree ref reh rei rel reo rep rer ret rfa rfd rfe rff rfh rfi rfl rfo rfp rfr rft rh- rha rhd rhe rhf rhh rhi rhl rho rhp rhr rht ria rid rie rif rih rii ril rio rip rir rit rla rld rle rlf rlh rli rll rlo rlp rlr rlt roa rod roe rof roh roi rol roo rop ror rot rpa rpd rpe rpf rph rpi rpl rpo rpp rpr rpt rra rrd rrf rrh rri rrl rrp rrr rrt rta rtd rte rtf rti rtl rto rtp rtr rtt taa tad tae taf tah tai tal tao tap tar tat tda tdd tde tdf tdh tdi tdl tdo tdp tdr tdt te- tea ted tee tef teh tei tel teo tep ter tet tfa tfd tfe tff tfh tfi tfl tfo tfp tfr tft th- tha thd the thf thh thi thl tho thp thr tht tia tid tie tif tih tii til tio tip tir tit tla tld tle tlf tlh tli tll tlo tlp tlr tlt to- toa tod toe tof toh toi tol too top tor tot tpa tpd tpe tpf tph tpi tpl tpo tpp tpr tpt tra trd tre trf trh tri trl tro trp trr trt tta ttd tte ttf tth tti ttl tto ttp ttr ttt