i-v iii iio iip iit iix io- ioi ioo iop iot iov ipi ipo ipp ipt ipv ipx iti ito itp itt itv itx ivi ivo ivp ivt ivv ivx ixi o-i oii oio oip oit oiv oo- ooi ooo oop oot oov oox op- opi opo opp opt opv opx ot- oti oto otp ott otv ov- ovi ovo ovp ovv ox- oxi oxo oxt oxx p-p pii pio pip pit piv pix poi poo pop pot pov pox ppi ppo ppp ppt ppv ppx pt- pti pto ptp ptt ptv ptx pvi pvo pvp pvt pvv pxt t-x tii tio tip tit tiv tix to- toi too top tot tov tox tpi tpo tpp tpt tpv tpx tti tto ttp ttt ttv ttx tvi tvo tvp tvt tvx txi txt vi- vii vio vip vit viv vix voi voo vop vot vov vox vpi vpo vpp vpt vpx vti vto vtt vtv vtx vvi vvo vvt vvv vxv xii xio xit xiv xix xoi xoo xop xot xov xox xpo xpp xpt xti xtp xtv xtx xvi xvt xxi xxo xxp xxv xxx