fff ffi ffo ffp fft fif fii fip fit fof foi foo fop fot fpi fpo fpp fpt ftf fti fto ftp ftt i-f iff ifi ifo ifp ift iif iii iio iip iit io- iof ioi ioo iop iot ipf ipi ipo ipp ipt itf iti ito itp itt o-i of- off ofi ofo ofp oft oif oii oio oip oit oo- oof ooi ooo oop oot op- opf opi opo opp opt ot- otf oti oto otp ott p-p pff pfi pfo pfp pft pif pii pio pip pit pof poi poo pop pot ppf ppi ppo ppp ppt pt- ptf pti pto ptp ptt tff tfi tfo tfp tft tif tii tio tip tit to- tof toi too top tot tpf tpi tpo tpp tpt ttf tti tto ttp ttt