a-a a-t aaa aao aap aat aax aay aoa aoo aop aot aox ap- apa apo app apt apx apy at- ata ato atp att atx ax- axa axo axp axt axx ay- aya ayo ayp ayt ayx oaa oao oap oat oax oo- ooa ooo oop oot oox op- opa opo opp opt opx opy ot- ota oto otp ott ox- oxa oxo oxt oxx oxy oya oyo p-p paa pao pap pat pax pay poa poo pop pot pox poy ppa ppo ppp ppt ppx pt- pta pto ptp ptt ptx pty pxt py- pya pyo pyt pyx t-x taa tao tap tat tax tay to- toa too top tot tox toy tpa tpo tpp tpt tpx tta tto ttp ttt ttx tty txt tya tyo typ tyt xaa xap xat xoa xoo xop xot xox xpa xpo xpp xpt xtp xtx xty xxo xxp xxx xxy xyp xyy yaa yao yap yat yax yay yoo yop yot yox yoy ypa ypo yta yto ytp ytt yxa yxy yyt yyy