eee eef eek een eeo eew ef- efe eff efo efw eke ekf eko en- ene enf enk enn eno enw eo- eoe eof eok eon eoo eow ewe ewf ewk ewo eww fee fef fek fen feo few ffe fff ffk ffn ffo ffw fkf fkk fne fnf fnk fnn fnw foe fof fok fon foo fow fwe fwf fwn fwo ke- kee kef kek ken keo kew kff kfo kfw kke kkk kkn kn- kne knf knk knn kno koe kof kok kon koo kow kw- kwf kwk kwo kww ne- nee nef nek nen neo new nfe nff nfk nfn nfo nke nkf nkk nkn nko nne nnf nnk nnn nno nnw no- noe nof nok non noo now nwe nwf nwn nwo oee oef oen oeo of- ofe off ofn ofo ofw oke okk oko okw on- one onf onk onn ono oo- oof ook oon ooo oow owe owf owk own owo oww wee wef wek wen weo wew wfe wff wfk wfn wfo wfw wke wkf wko wkw wn- wne wnf wnn wno wnw woe wof wok won woo wow wwe wwf wwn wwo www