a-wa aaaa aaaf aafa aaff aaoo aaow aata aatf aatt aatw aawt aaww afaa afao afat affa affo afft affw afoa afoo afta aotf at-t ataa atat atof atot atta atto atwa atwo atwt awoo awow awwa faaa fafa faff fafo fata fatf fato fatt fawf fawt ffff fftf fftw foaf fofo foof foot fota foto fott fotw fttw ftwo oafo off- offa offo ofta ooaa ooff oooo ootw oto- otof otoo otow otta otto otwo owow owt- owtt owwa taa- taaf taat tafa taff tafo taft taoa tata tato tatt tawa tawo tawt taww tfot toat toaw tofa toff tofo toft tooa toof toot tota toto tott towa ttfa ttff tttt twat two- twoa twof twoo twot waaa waaf waao waat waaw wafa waff waft waoo waow wata wato watt watw wawa wawf wawo wawt wfaa wfat wfaw wfff wfot wfta wftf wftw wfwa wfwo woaa woat woff woft woof woot woow wott wotw wowf wowo wowt woww wtaw wtof wtot wtow wtta wttf wtto wttt wttw wtwa wtwf wtwo wtwt wtww wwfa wwfw wwof wwot wwow wwta wwtf wwtw wwwa wwww