-up fff ffo ffp ffs ffu fof foo fop fos fou fpo fpp fps fpu fsf fso fsp fss fsu fuf fuo fup fus fuu of- off ofo ofp ofs ofu oo- oof ooo oop oos op- opf opo opp ops os- osf oso osp oss osu ou- ouf ouo oup ous p-p pff pfo pfp pfs pfu pof poo pop pos pou ppf ppo ppp pps ppu ps- psf pso psp pss psu puf pup pus puu sff sfo sfp sfs sfu sof soo sop sos sou spf spo spp sps spu ss- ssf sso ssp sss ssu suf suo sup sus suu uff ufo ufp ufs ufu uoo uop uos up- upf upo upp ups upu usf uso usp uss usu uus uuu