upflow puflow ufplow fuplow pfulow fpulow uplfow pulfow ulpfow lupfow plufow lpufow uflpow fulpow ulfpow lufpow flupow lfupow pfluow fpluow plfuow lpfuow flpuow lfpuow upfolw pufolw ufpolw fupolw pfuolw fpuolw upoflw puoflw uopflw oupflw pouflw opuflw ufoplw fuoplw uofplw oufplw fouplw ofuplw pfoulw fpoulw pofulw opfulw fopulw ofpulw uplofw pulofw ulpofw lupofw pluofw lpuofw upolfw puolfw uoplfw ouplfw poulfw opulfw ulopfw luopfw uolpfw oulpfw loupfw olupfw ploufw lpoufw polufw oplufw lopufw olpufw uflopw fulopw ulfopw lufopw fluopw lfuopw ufolpw fuolpw uoflpw ouflpw foulpw ofulpw ulofpw luofpw uolfpw oulfpw loufpw olufpw floupw lfoupw folupw oflupw lofupw olfupw pflouw fplouw plfouw lpfouw flpouw lfpouw pfoluw fpoluw pofluw opfluw fopluw ofpluw plofuw lpofuw polfuw oplfuw lopfuw olpfuw flopuw lfopuw folpuw oflpuw lofpuw olfpuw upflwo puflwo ufplwo fuplwo pfulwo fpulwo uplfwo pulfwo ulpfwo lupfwo plufwo lpufwo uflpwo fulpwo ulfpwo lufpwo flupwo lfupwo pfluwo fpluwo plfuwo lpfuwo flpuwo lfpuwo upfwlo pufwlo ufpwlo fupwlo pfuwlo fpuwlo upwflo puwflo uwpflo wupflo pwuflo wpuflo ufwplo fuwplo uwfplo wufplo fwuplo wfuplo pfwulo fpwulo pwfulo wpfulo fwpulo wfpulo uplwfo pulwfo ulpwfo lupwfo pluwfo lpuwfo upwlfo puwlfo uwplfo wuplfo pwulfo wpulfo ulwpfo luwpfo uwlpfo wulpfo lwupfo wlupfo plwufo lpwufo pwlufo wplufo lwpufo wlpufo uflwpo fulwpo ulfwpo lufwpo fluwpo lfuwpo ufwlpo fuwlpo uwflpo wuflpo fwulpo wfulpo ulwfpo luwfpo uwlfpo wulfpo lwufpo wlufpo flwupo lfwupo fwlupo wflupo lwfupo wlfupo pflwuo fplwuo plfwuo lpfwuo flpwuo lfpwuo pfwluo fpwluo pwfluo wpfluo fwpluo wfpluo plwfuo lpwfuo pwlfuo wplfuo lwpfuo wlpfuo flwpuo lfwpuo fwlpuo wflpuo lwfpuo wlfpuo upfowl pufowl ufpowl fupowl pfuowl fpuowl upofwl puofwl uopfwl oupfwl poufwl opufwl ufopwl fuopwl uofpwl oufpwl foupwl ofupwl pfouwl fpouwl pofuwl opfuwl fopuwl ofpuwl upfwol pufwol ufpwol fupwol pfuwol fpuwol upwfol puwfol uwpfol wupfol pwufol wpufol ufwpol fuwpol uwfpol wufpol fwupol wfupol pfwuol fpwuol pwfuol wpfuol fwpuol wfpuol upowfl puowfl uopwfl oupwfl pouwfl opuwfl upwofl puwofl uwpofl wupofl pwuofl wpuofl uowpfl ouwpfl uwopfl wuopfl owupfl woupfl powufl opwufl pwoufl wpoufl owpufl wopufl ufowpl fuowpl uofwpl oufwpl fouwpl ofuwpl ufwopl fuwopl uwfopl wufopl fwuopl wfuopl uowfpl ouwfpl uwofpl wuofpl owufpl woufpl fowupl ofwupl fwoupl wfoupl owfupl wofupl pfowul fpowul pofwul opfwul fopwul ofpwul pfwoul fpwoul pwfoul wpfoul fwpoul wfpoul powful opwful pwoful wpoful owpful wopful fowpul ofwpul fwopul wfopul owfpul wofpul uplowf pulowf ulpowf lupowf pluowf lpuowf upolwf puolwf uoplwf ouplwf poulwf opulwf ulopwf luopwf uolpwf oulpwf loupwf olupwf plouwf lpouwf poluwf opluwf lopuwf olpuwf uplwof pulwof ulpwof lupwof pluwof lpuwof upwlof puwlof uwplof wuplof pwulof wpulof ulwpof luwpof uwlpof wulpof lwupof wlupof plwuof lpwuof pwluof wpluof lwpuof wlpuof upowlf puowlf uopwlf oupwlf pouwlf opuwlf upwolf puwolf uwpolf wupolf pwuolf wpuolf uowplf ouwplf uwoplf wuoplf owuplf wouplf powulf opwulf pwoulf wpoulf owpulf wopulf ulowpf luowpf uolwpf oulwpf louwpf oluwpf ulwopf luwopf uwlopf wulopf lwuopf wluopf uowlpf ouwlpf uwolpf wuolpf owulpf woulpf lowupf olwupf lwoupf wloupf owlupf wolupf plowuf lpowuf polwuf oplwuf lopwuf olpwuf plwouf lpwouf pwlouf wplouf lwpouf wlpouf powluf opwluf pwoluf wpoluf owpluf wopluf lowpuf olwpuf lwopuf wlopuf owlpuf wolpuf uflowp fulowp ulfowp lufowp fluowp lfuowp ufolwp fuolwp uoflwp ouflwp foulwp ofulwp ulofwp luofwp uolfwp oulfwp loufwp olufwp flouwp lfouwp foluwp ofluwp lofuwp olfuwp uflwop fulwop ulfwop lufwop fluwop lfuwop ufwlop fuwlop uwflop wuflop fwulop wfulop ulwfop luwfop uwlfop wulfop lwufop wlufop flwuop lfwuop fwluop wfluop lwfuop wlfuop ufowlp fuowlp uofwlp oufwlp fouwlp ofuwlp ufwolp fuwolp uwfolp wufolp fwuolp wfuolp uowflp ouwflp uwoflp wuoflp owuflp wouflp fowulp ofwulp fwoulp wfoulp owfulp wofulp ulowfp luowfp uolwfp oulwfp louwfp oluwfp ulwofp luwofp uwlofp wulofp lwuofp wluofp uowlfp ouwlfp uwolfp wuolfp owulfp woulfp lowufp olwufp lwoufp wloufp owlufp wolufp flowup lfowup folwup oflwup lofwup olfwup flwoup lfwoup fwloup wfloup lwfoup wlfoup fowlup ofwlup fwolup wfolup owflup woflup lowfup olwfup lwofup wlofup owlfup wolfup pflowu fplowu plfowu lpfowu flpowu lfpowu pfolwu fpolwu poflwu opflwu foplwu ofplwu plofwu lpofwu polfwu oplfwu lopfwu olpfwu flopwu lfopwu folpwu oflpwu lofpwu olfpwu pflwou fplwou plfwou lpfwou flpwou lfpwou pfwlou fpwlou pwflou wpflou fwplou wfplou plwfou lpwfou pwlfou wplfou lwpfou wlpfou flwpou lfwpou fwlpou wflpou lwfpou wlfpou pfowlu fpowlu pofwlu opfwlu fopwlu ofpwlu pfwolu fpwolu pwfolu wpfolu fwpolu wfpolu powflu opwflu pwoflu wpoflu owpflu wopflu fowplu ofwplu fwoplu wfoplu owfplu wofplu plowfu lpowfu polwfu oplwfu lopwfu olpwfu plwofu lpwofu pwlofu wplofu lwpofu wlpofu powlfu opwlfu pwolfu wpolfu owplfu woplfu lowpfu olwpfu lwopfu wlopfu owlpfu wolpfu flowpu lfowpu folwpu oflwpu lofwpu olfwpu flwopu lfwopu fwlopu wflopu lwfopu wlfopu fowlpu ofwlpu fwolpu wfolpu owflpu woflpu lowfpu olwfpu lwofpu wlofpu owlfpu wolfpu
Note: these 'words' (valid or invalid) are all the permutations of the word upflow. These words are obtained by scrambling the letters in upflow.