a-a a-t aaa aaf aao aap aar aat af- afa aff afo afp afr aft aoa aof aoo aop aor aot ap- apa apf apo app apr apt ar- ara arf aro arp arr art at- ata atf ato atp atr att faa faf fao fap far fat ffa fff ffo ffp ffr fft foa fof foo fop for fot fpa fpo fpp fpr fpt fra frf fro frp frr frt fta ftf fto ftp ftr ftt oaa oaf oao oap oar oat of- ofa off ofo ofp ofr oft oo- ooa oof ooo oop oor oot op- opa opf opo opp opr opt or- ora orf oro orp orr ort ot- ota otf oto otp otr ott p-p paa paf pao pap par pat pfa pff pfo pfp pfr pft poa pof poo pop por pot ppa ppf ppo ppp ppr ppt pra prf pro prp prr prt pt- pta ptf pto ptp ptr ptt ra- raa raf rao rap rar rat rfa rff rfo rfp rfr rft roa rof roo rop ror rot rpa rpf rpo rpp rpr rpt rra rrf rrp rrr rrt rta rtf rto rtp rtr rtt taa taf tao tap tar tat tfa tff tfo tfp tfr tft to- toa tof too top tor tot tpa tpf tpo tpp tpr tpt tra trf tro trp trr trt tta ttf tto ttp ttr ttt