a-a a-t aaa aad aap aar aat ad- ada add adp adr adt ap- apa apd app apr apt ar- ara ard arp arr art at- ata atd atp atr att daa dad dap dar dat dda ddd ddp ddr ddt dpa dpd dpp dpr dpt dra drd drp drr drt dta dtd dtp dtr dtt p-p paa pad pap par pat pda pdd pdp pdr pdt ppa ppd ppp ppr ppt pra prd prp prr prt pt- pta ptd ptp ptr ptt ra- raa rad rap rar rat rda rdd rdp rdr rdt rpa rpd rpp rpr rpt rra rrd rrp rrr rrt rta rtd rtp rtr rtt taa tad tap tar tat tda tdd tdp tdr tdt tpa tpd tpp tpr tpt tra trd trp trr trt tta ttd ttp ttr ttt